Simple Definition of quarter hour
: 15 minutes : a period of time that lasts for 15 minutes
Full Definition of quarter hour
1 : fifteen minutes
2 : any of the quarter points of an hour
3 : a unit of academic credit representing an hour of class (as lecture class) or three hours of laboratory work each week for an academic quarter
Examples of quarter hour
Trains depart every quarter hour.
I waited a quarter hour in line.
First Known Use of quarter hour
Seen and Heard
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