(nautical, idiomatic) To die, to perish.

Quality of being numbered.

plural of number 2 pencil

Synonym of mass 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.

A city in Iowa / the praenomen of the legendary second king of Rome, Numa Pompilius

(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).

(mathematics) An element of the two-dimensional algebra over the field of real numbers which contains an element ȷ ≠ 1 satisfying ȷ² = 1.