Definition of: through

(thr) prep.
1. From end to end, side to side, or limit to limit of; into at one side, end, or point, and out of at another.
2. Covering, entering, or penetrating all parts of; throughout; also, over the surface of.
3. From the first to the last of; during the time or period of.
4. In the midst of; here and there upon or in.
5. By way of: He departed through the door.
6. By means of; by the instrumentality or aid of.
7. Having reached the end of, especially with success: He got through his examinations easily.
8. On account of; because or as a result of. See synonyms under BY.
—adverb
1. From one end, side, surface, etc., to or beyond another.
2. From beginning to end.
3. To a termination or conclusion, especially a successful one: to pull through.
4. Completely; entirely: He is wet through.
—through and through Thoroughly; completely.
—adjective
1. Going from beginning to end without stops or with very few stops, and without reshipment or change: a through train; also, pertaining to or serving an entire distance or route: a through ticket.
2. Extending from one side or surface to another.
3. Unobstructed; open; clear: a through road.
4. Arrived at an end; finished: Are you through with my pen?
5. At the end of all relations or dealings: He is through with his old friends. Also spelled thru. [OE thurh]