half hour noun
[singular] 1 : 30 minutes
▪ Trains depart every half hour. : a period of time that lasts for 30 minutes ▪ I waited a half hour in line. 2 : the middle point of an hour
▪ Tours start on the half hour. [=at 12:30, 1:30, 2:30, etc.]
▪ Trains depart every half hour. : a period of time that lasts for 30 minutes ▪ I waited a half hour in line.
▪ Tours start on the half hour. [=at 12:30, 1:30, 2:30, etc.]
