Math Dictionary
( A - C ) ( D - F ) ( G - K ) ( L - P ) ( Q - T ) ( U- Z )

D
data - information
date - the time when something happen or happened.
dearness allowance - an agreement to grant an increse in wages in case of a rise i the cost of living.
debenture - a written acknowledgement of a debt.
debenture bond - a bond issued by a company acknowledging indebtedness for a sum on which interest is due until the
principal is paid
debit - an rntry of something owed in a ccount.
debit card - a smal plastic with a code number enabling a bank costumer to withdraw cash or make dposit by a automatic teller
machine and to charge purchases directly to funds on deposit in the bank.
decade - ten years from 1900 to 1910;two decades ago means 20 years age.
decagon - a plain figure having ten angles and ten sides
decagram - a unit of mass in the metric of mass in the metric system equal to 10 grams or 0.3527 ounce.
decahedron - a solid figure having ten flat sharp angle surfaces.
decaliter - a unit of measure of volume in the metric system equal to liters.
decameter - a unit of measure of length in the metric system equal to 10.
decimal numbers - the numbers in the base 10 number system.
decimal fraction - a fracton whose denominator is 10 or mltiple of 10,expressed by placing a decimal point to the left
of the numerator.
decimalis - an expert in the used of the decimal system.
decimal point - a period placed before a fraction in decimal figures as in 2.03 or .623
decimal sysytem - any system of numeration which based on the units of ten.
decimeter - a unit of measure of lenght in the metric system equal to one tenth of a meter, or about 3.937 inches.
decreasing function - a function is considered to be decreasing if f (b) < f (a) when b>a.
deduction - a conclusion arrived at by reasoning.
deductive reasoning - a process in which conclusion are drawn logically from given information.
degree - a unit for measuring temperature.
degree of angles - a unti of measures of angles.
degree of an expression - the greatest exponent of the variables in the expression in simpliest form.
degree of polynomial - the greatest degree of any of the terms of a polynomial.
degree of a variable - in a monomial ,the number of times a variable occurs as a factor in monomial.
denominator - the bottom part of a fraction.
dependent variable - the output or matched value of a function.
deposit - to pay as a pledge for carrying out a promise to do something or to pay more later.
depositor - a person who deposits money in the bank.
deposit slip - a printed slip on which a bank deposit list the amount of checks bills or coin to be credited to his account.
depreciation - reduction in the value of money.
depreciation reserve - a reserve account to offset the cost of equipment that is depreciating and will ultimately
have to be replaced or renewed.
derivative - the rate of change ( speed, slope, velocity) of a function.
determinant - the determinant I ab I =ad-bc.I cd I
diagonal - a segment joining two non consecutive vertices of a polygons.
diameter - a chord passing through the center of a circle or a sphere.
difference - the result of subtracting two numbers.
differentiables - a function is differentiables over an interval if it is continous over the interval and if the derivative exist
everywhere on the interval.
differentiation - the process of finding a derivative.
digit - the symbols 0,1,2,3,4,5,6,7,8,and 9.
digital computer - a type of electronic calculating machine using numbers expressed as digit of some numerical system
to solve problem which can be expressed mathmatically.
dime - a coin of the United States worth 10 cents
dimension - a measurement of length. breadth or thickness.
dimidiate - to divide into halves
diminished - made smaller;lessened.
direct - the following the natural order.
direct cost - a cost which can be assigned to a particular product as distinguised from overhead.
direct liability - a definite obligation such as a loan or purchase of goods or services on credit, which can be specified from
contigent liability.
disbursement - the act of paying out.
discount - the amount taken off from a price.
discount rate -a rate of interest charged for discounting notes.
discrete geometry - a study of points as dots separated
discriminant - tells how many roots there are for the equation and the nature of the roots .
disjoint - having no elements in common.
disjunction - the act of disjoining
disprofit - disadvantage;inconvenience.
distance - the absolute value of the differrence of the coordinates of any two points on a number line
. parallel lines -the distances between two parallel line is the distance from any point on the other line
. point and line - the distance between a line and an external point is the length of the perpendicular segment from the point to the line.
. point and plane - the distance to a plane from an external point is the length of the perpendicular segment from the point to the plane
divergent series - a series whose sum is infinite.
dividend - in a/b = c, a is the dividend property.
dividend warrant - an order to pay a devidend to a stockholder
division - the opposite operation of multiplication
divisor - a number or quantity by which another is to be divided.In 728 divided by 16, 16 is the divisor.
dodecagon - a plane figure having 12 angles and 12 sides.
dodecahedron - itis a polyhedron with twelve faces.
domain - the set of all possible values of the argument of a function.
double - a number or amount that is twice as much.
down payment - a payment in part or as a deposit for something bought or to be bought.
dozen - twelve;a group of twelve.
drwaing account - an account that shows withdrwals of money in a business for expenses
dual - composed or consisting of two parts.
dual fund - a close end trust whose stock is divided between shares of income and shares of capital stock.
duplicate. one of two or more things exactly alike.

E
each - every one considered separately or one by one.
earnest money - money paid as a pledge.
eccentricity - a number that indicates the shape of a conic section. The eccentricity of an ellipse is given by e
= sqrt (a2 -b2) /a
edit - to alter ;to revise
effect - the power to produce reslt.
eight - one more than seven.
eight folds - having eight parts or members.
eighteen - eight more than ten .
eightieth - next after the 79th.eight square
eight square - having eight corners;octagonal
element - and item or number that is part of a set.
ellipse - the set of all points in a place such that the sum of the distances to two fixed points is a constant.
ellipsoid - a solid of revolution formed by rotating an ellipse about one of its axes.
empty set - the intersection of two set that contain no elements;the intersection of the set of all even numbers
and the set of all odd numbers, is an empty set
encircle - to form a circle around.
enlarge - to make larger
equal - the same in amount,size, number value, degree, or rank.
equalateral - a figure having all side equal.
equality - the condition of quality of being equal ;exact likeness in amount, size number,value degree or rank.
equal sets - sets that have the same members, regardless of teir arrangement (2,7,9) and (7,9,2) are equal sets.
equal sign - a sign used especially in mathematics and logic to show the equality or sameness of two quantities or things
equal time - an equal opportunity to reply to any charge or opposing views.
equant - the circle whose center epicycyle of a planet supposedly describes equal angles at equal times.
equation - statement of equality between two quantites ,indicated by using equal sign.
equator - an imaginary circle around the middle of the earth.
equiangular - having all angles equal.A square is equiangular.
equiangular triangles - a triangle with three interior angles congruent to each other.
equidistant - the condition of a point "P" lying between two points "A" and "B" such
that PA=PB.
equialteral - having all sides congruent.
equity - the amount that a property is worth beyond what is owed on it.
equity capital - the funds in the business which have been invested by the owners and not loan by others .
equity of redemtion - the priviledge extended to the mortgagor of redeeming the mortgaged property by
payment of mortgage and interest even after his default.
equivalent - the same in value, measure ,force, effect, meaning,power,importance, or significance.
equivalent equations - two equations whose solution are the same .
equivalent sets -set a that have the same numbers of members and which can be put into one to one correspondence
with each other.
evaluate - an expression , to find the value of an algerbraic expression by substituting a given value for each
variable and simplifying.
even function - a function that satisfliess the property that f(x) = f(-x).
even number - a natural number that is divisble by 2
event - any one of the possible outcomes of an experiment.
ever - at any time;always.
every - each one of the entire number.
every other - every second ;alternate
exact - without any error or mistakes ;accurate;precise.
exaction - the act or process of exacting;forcing to be paid.
exceed - to be more or greater F than .The sum of 5 and 7 exceed 10.
excess - the amount by which one things is more than the other.
excessive - to much; too great;going beyond what is necessary.
excel - to be better than surpass;otdo.
exchange - giving up of one things or receiving or taking another;barter;swap.
exchange rate - rate of exchange especially of one country's money for another.
exchange value - the value of a thing measured by what may be produced in exchange.
exchequer - a treasury,especially of a state or nation.
excise - a tax on the anufacture ,sales,or use of certain articles made, sold or use within a country
exponent - a small number written above and to the right of a symbol or quantity to show how many times the symbol or
quantity is to be used a factor.
exponential - having to do with algebraic exponents.
exponential curve - a curve or an equation depending on an exponential function.
exponential function - a function of the form f(x) = ax, where a is a constant known as base.
export - to send products out of one country for sale.
express - system or company that carries packages for money.
expropriation - the taking of land or other property from the owner,specially for public use
exterior angle - any one of the four angles formed outside of two parallel lines intersected by a straight line.
extent - a continous magnitude of dimension.
extention - the property of a body to by which it occupies a portion of space.
extensometer - an instrument for measuring minute degrees of expansion contraction or deformation as in
a bar of metal
extremes - in a proportion a/b =c/d,the numbers a and d are the extremes.
extremity - the every end; last part of the point.

F
face - flat,polygonal regions that make up a polyhedron.
factor - any of two or more numbers mutiplied to produced a product.
facto theorem - if P(x) is a plynomials, then if P =0, then (x-r) is a factor of P(x)
factorial - the product of all the integers from 1 up to the integers in question.
faculty tax - a tax based on the ability to pay.
fair market value - a value established by a buyer with a clear intention to buy and seller with a clear intention to sell
fair trade - to set a minimum retail price on a product.
fair value - the value of something as estimated for purpose of sale or taxation based on market value.
farenheit - based according to scale for measuring temperature on which 32 degrees marks the freezing point of water
and 212 degrees the boiling point at standard atmospheric pressure.
falsification - the act of falsifying; change made to deceive.
falsifier - a person who make counterfeit money
fathom - a unit of measure equal to 6 feet.
fathometer - a device for determining depth of water by sending sound waves through the water and timing their
return from the bottom .
fiducial edge - the thin edge of a ruler.
fiduciary bond - a bond issued to insure against losses due to the dishonesty or negligence,of a person appointed by the court,
to be responsible for another's property.
fifiteen - five more than ten.
fifteenth - next after the 14th.
fifth - the next after fourth.
fiftieth - next after the 49th.
fifty - fives times ten.
figurate - having a definite form or shape.
final - at the end ;with no more after it.
finable - subject or liable to the payment of fine on renewal.
finance - money matters; the science or conduct of monetary business or affairs.
finance company - a business firm that loans money on interest,especially to finance the purchase of goods.
financial statement - a report of financial data consisting of a statement of profit and loss.
financier - person occupied with or skilled in finance.
financing - the raising of money to back or manage an enterprise.
finite - a set whose elements can be counted.
firm - a company of two or more persons in business together.
firm bid - a commitment to buy a specified price within a specified time.
first quarter - the period of time between the new moon and the first half moon
first termer - one serving his first term.
frist timer - a person who does something for the first time.
fiscal year - the time between one yearly settlement of financial accounts and another.
fixed - not movable;made firm.
fixed asset - apiece of land,building and any other movable fixtures of a business.
fixed capital - capital in the form of land ,building or machinery which can be used recurrently without
change of form or possesion.
fixed charge - any of certain charges orr expenses such as rent,upkeep,taxes and depreciation that occur regularly or
continously in the operation of business
fixed income - earning at a fixed or nearly constant rate.
fixed liability - an obligation which does not mature for at least a year.
fixed price - a uniform price set for all buyers of a product.
fixed trust - an investment trust in which members are allowed to make investment only in a small number.
fixer - a person who dishonestly arranged beforehand the result of game,event or other circumstances of chances.
foreclose - to take away the right to redeem the mortgage.
foreign exchange - the system of settling accounts between people in different countries by giving and
receiving bills of exchange,letters of credit, travellers checks,or other commercial paper.
foreign trade zone - a port or area where foreign goods may be unloaded, stored and shipped without being subject
to customs duties or taxes.
forfeit - to lose or have to give up by one's own act neglect or fault.
foucault pendulum - a pendulum used by foucault in 1851 to demonstrate the earth rotates on it's axes.
four dimentional - of or denoting a space extent,set of magnitudes or other measures or function each of whose
elements can be precisely detrmined only by four coordinates.
four fold - four times as much or as many.
four footed - having four feet
fourier series - an infinite series using combinations of sines and cosines of the first degrees , used
to appropriate a function within a given domain.
fourth proportional - having four variables;in the proportion ,2 is 4 as 8 is to 16,16 is the fourth proportional.
fractals - a geometric figure created by repeating n infinite sequence of steps.
fractional - having to do with fraction .
fractional currency - coins or proper money having a value less than that of the basic monetary unit.
fraction - portion; part of a whole.
Types of common fraction are:
a. proper fraction - is a fraction in which the numerator is smaller than the denominator.
b. improper fraction - is a fraction in which the numerator is equal to or longer than the denominator
c. complex fraction - is a fraction in which the numerator or denominator or both fraction or mixed numbers.
d. mixed numbers - is a combination of a whole number and fraction.
fragment - piece of something broken.
frustum - the part of a coneshaped solid left after the top has been cut off by a plane parallel to the base.
frequency - the number of times an item occurs in a set of data.
frequency distribution - an arrangement of data according to size rather than time ,location or degree.
freezing point - the temperature at which the liquid freezes.The freezing point of water at sea level is 32 degrees
Fahrenheit or 0 degrees centigrade.
french curve - a flat finely curved device used as a template in draawing to make curves which are not true circles.
frustum - of a pyramid , the part of the pyramid bounded by the base ,a cross section ,and the trapezoid region of lateral faces.
full scale - having the same size and proprtion as the original.
function - a relationship between input and output.
functional calculus - the branch of symbolic logic that deals with propositional functions and relations and with quantifiers;predicate
calculus.
fund - a sum of money set aside for a special purpose.
functional analysis - the study of analysis and functional.
funny money - money that is not stable or redeemable.