[ noun ] a quarter of an hour
Used in print(L. Don Leet and Florence J. Leet, editors, The World of...)
The waves are separated by intervals of 15_minutes to an hour or more ( because of their great length ) , and this has often lulled people into thinking after the first great wave has crashed that it is all_over .(Peter J. White, "Report on Laos"...)
Could we be ready in 15_minutes ?