set

Irregular bedtimes may disrupt healthy brain development in young children, according to a study of intelligence and sleeping habits. ¶ Going to bed at a different time each night affected girls more than boys, but both fared worse on mental tasks than children who had a set bedtime, researchers found.

on your marks, get set, go!; on your marks, set, go!

set on getting to his destination

a set menu ― a meal that is instituted by a restaurateur for a limited occasion

I’m set against the idea of smacking children to punish them.