(used in questions) what one or ones:Which of these do you want?
whichever; the one that:Choose which appeals to you.
(used in relative clauses to refer back to a word that has already been mentioned and to pause to give it emphasis):This book, which I read last night, was exciting.
(used in a relative clause that starts with a preposition):That's the house in which I lived.
adj.[before a noun]
what one or ones of a number or group:Which book do you want?
what one?:Which of these do you want? Which do you want?
whichever:Choose which appeals to you.
(used relatively in restrictive and nonrestrictive clauses to represent a specified antecedent):The book, which I read last night, was exciting. The socialism which Owen preached was unpalatable to many. The lawyer represented five families, of which the Costello family was the largest.
(used relatively in restrictive clauses having that as the antecedent):Damaged goods constituted part of that which was sold at the auction.
(used after a preposition to represent a specified antecedent):the horse on which I rode.
(used relatively to represent a specified or implied antecedent) the one that; a particular one that:You may choose which you like.
(used in parenthetic clauses) the thing or fact that:He hung around for hours and, which was worse, kept me from doing my work.
[Nonstandard.]who or whom:a friend which helped me move; the lawyer which you hired.
adj.
what one of (a certain number or group mentioned or implied)?:Which book do you want?
whichever; any that:Go which way you please, you'll end up here.
being previously mentioned:It stormed all day, during which time the ship broke up.
bef. 900; Middle English; Old English hwilc, hwelc, equivalent. to hwe- (base of hwāwho) + -līc body, shape, kind (see like1); cognate with Old Frisian hwelik, Dutch welk, German welch, Gothic hwileiks literally, of what form
The relative pronoun which refers to inanimate things and to animals:The house, which we had seen only from a distance, impressed us even more as we approached.The horses which pulled the coach were bay geldings.Formerly, which referred to persons, but this use, while still heard (a man which I know), is nonstandard. Contrary to the teachings of some usage guides, which introduces both restrictive and nonrestrictive clauses. The "rule'' that which can be used only with nonrestrictive clauses has no basis in fact. In edited prose three-fourths of the clauses in which which is the relative pronoun are restrictive:A novel which he later wrote quickly became a bestseller.See also that.
used with a noun in requesting that its referent be further specified, identified, or distinguished from the other members of a class: which house did you want to buy?
(as pronoun): which did you find?
(used in indirect questions): I wondered which apples were cheaper
whatever of a class; whichever: bring which car you want
(as pronoun): choose which of the cars suit you
used in relative clauses with inanimate antecedents: the house, which is old, is in poor repair
as; and that: used in relative clauses with verb phrases or sentences as their antecedents: he died of cancer, which is what I predicted
the which ⇒ a longer form of which, often used as a sentence connector
Etymology: Old English hwelc, hwilc; related to Old High German hwelīh (German welch), Old Norse hvelīkr, Gothic hvileiks, Latin quis, quidUSAGE that
'in which' also found in these entries (note: many are not synonyms or translations):