(seduction community) To end a pickup of a woman by getting her telephone number.

(seduction community) The successful acquisition of a woman's telephone number at the end of a pickup attempt.

A positive integer that can be divided by two, and two itself. / (mathematics) An integer that is divisible by two.

(mathematics) Any integer that produces a noninteger when divided by two

A number that represents the reciprocal of the dispersive power of a substance with transparent qualities.

(mathematical analysis, nonstandard analysis) A hyperreal number which is not a real number.

(combinatorics) Any one of a certain set of numbers which are guaranteed to exist by Ramsey's theorem; a positive integer which is a certain function of some given multiset of positive integers, where that "certain function" is that which yields the minimal number guaranteed to exist by Ramsey's theorem.

(grammar) A grammatical number denoting a quantity of exactly two.

(mathematical analysis, number theory) Any one of the rational numbers in a sequence of such that appears in numerous contexts, including formulae for sums of integer powers and certain power series expansions.

(mathematics) Any element of a field equivalent to the real numbers augmented with infinite and infinitesimal numbers (respectively larger and smaller (in absolute value) than any positive real number).