Dalton's law: States that the total pressure exerted by a gaseous mixture is equal to the sum of the partial pressures of each individual component in a gas mixture.
data: Gathered information.
decimal number: The numbers in the base 10 number system, having one or more places to the right of a decimal point.
decimal point: A symbol (looking exactly like a period) used to separate the whole number part (on the left) from the fractional part (on the right).
degree: A unit of measure for angles equal to 1/360 of a full circle.
denominator: The bottom part of a fraction.
density: Mass per unit volume of a substance.
dependent events: Two events in which the outcome of the second is influenced by the outcome of the first.
dependent system: The equations of a system are dependent if all the solutions of one equation are also solutions of the other equation.
depreciation: A decrease in value.
derivative: A measurement of how a function changes when the values of its inputs change.
determinant: A function depending on n that associates a scalar det(A) to every n×n square matrix A .
diagonal: A line segment connecting two nonadjacent vertices in a polygon.
diagram: A figure, usually a line drawing, that illustrates a geometrical theorem.
diameter: A line segment joining two points on a circle and passing through the center of the circle.
difference: The result of subtracting two numbers.
digit: The ten symbols 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , and 9 . The number 215 has three digits: 2 , 1 , and 5 .
dilatation: The enlargement or reduction of a plane figure.
dimension: A facet, aspect, or side of an object.
directrix: A fixed line associated with a parabola.
discriminant: In algebra, the discriminant of a polynomial with real or complex coefficients is a certain expression in the coefficients of the polynomial which is equal to zero if and only if the polynomial has a multiple root (i.e. a root with multiplicity greater than one) in the complex numbers.
distance: Length, as between two points.
distributive property: a(b+c)=ab+ac
divide: To perform the operation of division.
dividend: In  a is the dividend.
divisible: Capable of being evenly divided by a number, without a remainder.
division: The process of dividing two numbers.
divisor: In  b is the divisor.
domain: The set of all first coordinates in a function.
double: To multiply by 2 ; determine twice as much.
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