(mathematics) A Keith number.

(UK politics) Synonym of 10 Downing Street.

(mathematics) The minimum, taken over all planar representations of a link or graph, of the number of times it crosses itself.

The house number painted on the curb of the street in front of a building.

To queue; to wait to be served by being assigned a number and waiting for that number to be called after all previous numbers have been served in order of assignment.

Alternative spelling of number two / Short form of number 2 pencil

Alternative spelling of wavenumber

A list whose items are numbered, with various styles including Arabic numerals and Roman numerals.

(grammar) A word that expresses a countable number of times; an adverbial numeral.

(grammar) A word that answers "how many times each?" or "how many at a time?"