Math Glossary Letter D d=rt noun Distance formula data noun Characteristics or information, usually numerical, that are collected through observation. date noun the day of the month or year as specified by a number day noun A unit of time equal to 24 hours debt noun money owed by one party to another party decade noun A unit of time equal to 24 hours decagon noun 10 sided polygon or 10-gon decay noun Reduction in size from decomposition deciliter noun A unit of liquid measurement decimal noun Number in the form a/b where the result is not a whole number decimal degrees noun express latitude and longitude geographic coordinates as decimal fractions decimal place noun the position of a digit to the right of a decimal point. declining balance depreciation noun depreciation method using a ratio of salvage to asset value as a factor decompose noun break down a fraction into smaller parts decompose fraction noun break apart a fraction where the numerators equal 1 deficient numbers noun A number (n) with the sum of proper factors less than n degree noun A unit of angle measurement, or a unit of temperature measurement degrees of freedom noun number of values in the final calculation of a statistic that are free to vary delta noun A letter of the greek alphabet used for math notation.Δ δ demand noun a consumer desire to purchase goods and services and willingness to pay a specific price for them demoivres theorem noun A formula useful for finding powers and roots of complex numbersz = r cis(θ ), then zn r n n θ ) denomination noun A currency unit denominator noun The bottom portion of a fraction. For a/b, b is the denominator density noun The compactness measure of an object dependent variable noun A variable reliant on another variable deposit noun a sum of money placed or kept in a bank account, usually to gain interest. depreciation noun The reduction in value of an asset over time derangement noun permutation with no fixed points!n derivative noun rate at which the value y of the function changes with respect to the change of the variable x descartes rule noun determine the number of real zeros of a polynomial function descending verb to arrange numbers in decreasing order, that is, from largest to smallest. determinant noun value computed from a square matrixdet(A) or |A| dewey decimal system noun proprietary library classification system diagonal noun line segment that goes from one corner to another, but is not an edge diagonal of a square noun line segment that goes from one corner of a square to another, but is not an edge diagonals of a polygon noun line segment that goes from one corner of a polygon to another, but is not an edge diameter noun distance from two endpoints of a circle through the centerd = 2r diameter of a circle noun distance from two endpoints of a circle through the centerd = 2r diameter of a cylinder noun distance from two endpoints of a cylinder through the center diametrically opposed noun Two points on a circle or sphere at opposite ends of the diameter. diametrically opposed noun Two points directly opposite each other on a circle or sphere dice noun objects used in games of chance wih 6 sides dices coefficient noun statistic used for comparing the similarity of two samples|A ∩ B|/(|A| + |B|) difference noun the result of one of the important mathematical operations, which is obtained by subtracting two numbers difference of proportion noun hypothesis test to determine whether the hypothesized difference between population proportions differs significantly from the observed sample difference difference of squares noun Binomial factoring formulaa2 - b2 = (a + b)(a - b) digit noun Any of the numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) used to construct a number digit problems noun math problems involving variables for each place value, h for hundreds, t for tens, and o for ones as an example digit product noun Multiplying the digits of a number and repeating the process of the product until all digits have been multiplied together digit sum noun Adding the digits of a number and repeating the process of the sum until the final sum is less than 10 digraph noun a combination of two letters representing one sound dime noun currency unit worth 10 cents dimension noun the number of rows by the number of columns for a matrix diophantine noun equation in which only integer solutions are allowed direct current noun Undirectional flow of an electric charge direction noun the line or course on which something is going directrix noun line in a parabola not through the focus discount noun the amount by which the market price of a bond is lower than its principal amount due at maturity discount rate noun the interest rate used in discounted cash flow (DCF) analysis to determine the present value of future cash flows. Key Takeaways. discrete math noun Deals with math structures which is not continuous, rather discrete discrete random variable noun a type of variable whose value depends upon the numerical outcomes of a certain random phenomenon discriminant noun Shows how many roots and their properties a polynomial hasΔ disjoint sets noun Sets with no common elements disjunction noun a binary connective classically interpreted as a truth function the output of which is true if at least one of the input sentences (disjuncts) is true, and false otherwise displacement noun Movement of an object from it's current position distance noun interval between two points in timed = rt distance catch up noun word problems involving a staggered start between 2 people or objects to see when they meet distance rate and time noun formula relating distance, rate, and timed = rt distribution noun value range for a variable Distributive Property noun Property stating you can multiply a sum by multiplying each addend separately and then add the productsa(b + c) = ab + ac divide verb To split into equal parts or groups÷ dividend noun a reward paid to the shareholders for their investment in a company's equity dividend discount model noun A formula used to value a stock based on the present value of dividendsP = D/(i - k) where i is the interest rate and k is the growth rate of dividends dividing verb separate a number into parts divisibility noun Determine factors (whole numbers) for a given number division noun separate a number into parts division equality noun f you divide one side of an equation by a number, you also must divide the other side by the same number so that your equation stays the same Division Property of Inequality noun f you divide one side of an inequality by a number, you also must divide the other side by the same number so that your inequality stays the same divisor noun a number by which another number is to be divided. dollar noun Currency unit dollar weighted interest method noun Evaluating a fund's interest based on the amount invested domain noun Set of all possible input values which makes the output value of a function valid dot product noun The sum of the products of corresponding components. Equivalently, it is the product of their magnitudes, times the cosine of the angle between thema · b double noun Multiply by 2 double declining balance depreciation noun depreciation method using a ratio of salvage to asset value as a factor. The asset loses value at twice the rate of the straight line depreciation method double factorial noun Factorial method subtracting 2 from each successive number, instead of 1 like a standard factorialn!! doubling time noun the amount of time it takes for a given quantity to double in size or value at a constant growth rate dozen noun Quanity of 12 drawing from a container noun Probability method of selecting objects from a container and computing the probability duplication and mediation noun Algorithm to compute the product of two numbers, using even sub-products duration noun the weighted average of the times until those fixed cash flows for a bond are received.