An hour is a unit of time that is equal to 60 minutes. There are 24 hours in a day.
We use hours to measure time. For example, we say that it is 8 o'clock in the morning, or that we have an hour to go before the movie starts.
Hours are also used to measure the speed of things. For example, we say that a car is traveling at 60 miles per hour, or that a runner ran a marathon in 2 hours and 30 minutes.
I'm going to the gym for an hour.
Noun: hour.
Adjective: hourly.
Adverb: hourly.
The word "hour" comes from the Old English word "hōr", which means "a division of the day or night". It was first used in English in the 8th century.
What is an hour?