定时

定时	dìng shí	to fix a time / fixed time / timed (of explosive etc)
定	dìng	to fix; to set; to make definite / to subscribe to (a newspaper etc); to book (tickets etc); to order (goods etc) / to congeal; to coagulate / (literary) definitely
时	shí	old variant of 时
时	Shí	surname Shi
时	shí	o'clock / time / when / hour / season / period