The Oxford Thesaurus An A-Z Dictionary of Synonyms - throughoutprep.

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.