prep. 1 during, all (the way) through, from the beginning to the end of We worked throughout the day and night Throughout his life he felt the need for constant support. 2 everywhere in, all over, in every part of, in every nook and cranny of, from one end to the other of I searched throughout the house for my keys
adv. 3 all (the way) through, everywhere, from one end to the other, wholly, entirely, completely, fully They were busy tidying the house throughout before his mother came to stay