Used other than figuratively or idiomatically: see random, number. / A number allotted randomly using suitable generator (electronic machine or as simple "generator" as die).

(number theory) An abundant number.

(number theory) A deficient number.

(number theory) A number that is greater than the sum of all of its divisors except itself.

(mathematics) The limit of a convergent sequence of rational numbers, whether the limit is a rational number such as 2, -5, or 2/7 or whether the limit is an irrational number such as the square root of two or the circumference of the circle whose radius is one.

(number theory) A number that is the sum of all of its divisors except itself.

(complex analysis, strict sense) A number of the form bi, where b is any real number and i denotes the imaginary unit.

A holiday in many countries to welcome the New Year of the Gregorian calendar on January 1.

(chiefly Britain) Alternative form of nonalcoholic

A vow that one makes on New Year's Eve or New Year's Day for the coming year.