Etymology: Middle English thurh, thruh, through, from Old English thurh; akin to Old High German durh through, Latin trans across, beyond, Sanskrit tarati he crosses over
Date: before 12th century
(1) — used as a function word to indicate movement into at one side or point and out at another and especially the opposite side of <drove a nail through the board> (2) by way of <left through the door> (3) — used as a function word to indicate passage from one end or boundary to another <a highway through the forest> <a road through the desert> (4) without stopping for ; past <drove through a red light> b. — used as a function word to indicate passage into and out of a treatment, handling, or process <the matter has already passed through her hands> 2. — used as a function word to indicate means, agency, or intermediacy: as a. by means of ; by the agency of b. because of <failed through ignorance> c. by common descent from or relationship with <related through their grandfather> 3. a. over the whole surface or extent of ; throughout <homes scattered through the valley> b. — used as a function word to indicate movement within a large expanse <flew through the air> c. — used as a function word to indicate exposure to a specified set of conditions <put him through hell> 4. — used as a function word to indicate a period of time: as a. during the entire period of <all through her life> b. from the beginning to the end of <the tower stood through the earthquake> c. to and including <Monday through Friday> 5. a. — used as a function word to indicate completion or exhaustion <got through the book> <went through the money in a year> b. — used as a function word to indicate acceptance or approval especially by an official body <got the bill through the legislature> II. adverb Date: before 12th century 1. from one end or side to the other 2. a. from beginning to end b. to completion, conclusion, or accomplishment <see it through> 3. to the core ; completely <soaked through> 4. into the open ; out <break through> III. adjective Date: 15th century 1. a. extending from one surface to another <a through mortise> b. admitting free or continuous passage ; direct <a through road> 2. a. (1) going from point of origin to destination without change or reshipment <a through train> (2) of or relating to such movement <a through ticket> b. initiated at and destined for points outside a local zone <through traffic> 3. a. arrived at completion or accomplishment <is through with the job> b. washed-up, finished
New Collegiate Dictionary. 2001.