noun
plural hours
[count] :one of the 24 equal parts of a day :60 minutes
[count] 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
[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.
c 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 Brit out of hours
after the regular hours of work or operation
an/per hour
used in measurements that describe the speed of something