Definition of hour
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
b
hours plural
: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
- hero of the hour
b
hours plural
:time of going to bed
- keeps late hours
- 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
—
after hours
:after the regular quitting or closing time
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