The property of being twelve in number.

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.

plural of twelve

(printing) duodecimo format

plural of twelve-stepper

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

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

plural of twelve o'clock

A bicycle having twelve gears.