noun
twelve o'clock; noon; midnight
Refers to the time of day at 12:00, either noon or midnight depending on context. Often clarified with 午前 (a.m.) or 午後 (p.m.).
会議は十二時から始まります。
The meeting starts at twelve o'clock.
十二時を過ぎても彼は来なかった。
He didn't come even after twelve o'clock.
Compound of 十二 (twelve) and 時 (hour/o'clock).