The ordinal form of the number twelve, describing a person or thing in position number 12 of a sequence.

One of twelve equal parts of a whole. / (music) An interval equal to an octave plus a fifth.

The cardinal number occurring after eleven and before thirteen, represented in Arabic numerals as 12 and in Roman numerals as XII.

A group of twelve items. / A twelve-bore gun. / (law, colloquial) A jury (normally composed of twelve persons). / (slang) The police; law enforcement, especially a narcotics officer.

A system of musical composition devised by Arnold Schoenberg, as a method of composing with twelve notes which are related solely to each other.

The season or time made up of the twelve days between Christmas and Epiphany; Christmas season, Christmas time, Christmastide, Twelvetide. The Christmas season traditionally ended with the feast of the Epiphany on January 6.

(music) A blues form built on a twelve-measure chord progression, most typically based around the tonic, subdominant and dominant seventh chords of a key.

(cricket, rare in the plural) A designated substitute player who may field but not bat or bowl.

(In both the 12-hour clock and the 24-hour clock) The start of the thirteenth hour of the day; noon (noontime); 12:00 p.m. (12:00).

(dated) A year.