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.

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

(printing) duodecimo format

plural of twelve

The property of being twelve in number.

The number 1200 one thousand two hundred / The year 1200.

(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).

plural of twelve o'clock

plural of twelve stepper (alternative spelling of twelve-steppers).

A person who is or has been a participant in a twelve-step program to recover from addiction.