Etymology: Middle English, from Anglo-French ure, eure, from Late Latin & Latin; Late Latin hora canonical hour, from Latin, hour of the day, from Greek hōra — more at year
Date: 13th century
1: a time or office for daily liturgical devotion; especially:canonical hour 2: the 24th part of a day : 60 minutes 3 a: the time of day reckoned in two 12-hour periods bplural: the time reckoned in one 24-hour period from midnight to midnight using a 4-digit number of which the first two digits indicate the hour and the last two digits indicate the minute <in the military 4:30 p.m. is called 1630 hours> 4 a: a customary or particular time <lunch hour><in our hour of need>; also:moment 1b <hero of the hour>bplural: time of going to bed <keeps late hours>; also: time of working <banker's hours> 5: an angular unit of right ascension equal to 15 degrees measured along the celestial equator 6: the work done or distance traveled at normal rate in an hour <the city was two hours away> 7 a: a class session b:credit hour, semester hour
— after hours: after the regular quitting or closing time