hour /ˈawɚ/ noun
plural hours
plural hours
Learner's definition of HOUR
[count] : one of the 24 equal parts of a day : 60 minutes
see also half hour, quarter hour
: the time shown on a clock or watch
: a particular time during the day
◊ The wee/small/early hours are the very early hours of the morning.
[count] : the time of a specified activity
see also eleventh hour, happy hour, rush hour, zero hour
[count] : a particular time or period of time
◊ The man/woman (etc.) of the hour is a person who is being honored or praised or who is enjoying success at a particular time.
◊ Someone's or something's darkest hour is a time of great trouble or danger.
◊ Someone's or something's finest hour is a time of great success, courage, or heroism.
hours [plural] : a time scheduled or used for a particular purpose or activity
[count] : the distance that can be traveled in an hour
hours [plural] used to refer to time when time is being measured on a 24-hour clock

after hours

or British out of hours
: after the regular hours of work or operation

an/per hour

used in measurements that describe the speed of something