Definition:
				
				
				- (a.) Of what sort or kind; what; what a; who.
- (a.) A interrogative pronoun, used both substantively and adjectively, and in direct and indirect questions, to ask for, or refer to, an individual person or thing among several of a class; as, which man is it? which woman was it? which is the house? he asked which route he should take; which is best, to live or to die?  See the Note under What, pron., 1.
- (pron.) A relative pronoun, used esp. in referring to an antecedent noun or clause, but sometimes with reference to what is specified or implied in a sentence, or to a following noun or clause (generally involving a reference, however, to something which has preceded). It is used in all numbers and genders, and was formerly used of persons.
- (pron.) A compound relative or indefinite pronoun, standing for any one which, whichever, that which, those which, the . . . which, and the like; as, take which you will.
Compare which with other words:
			
			
			including vs. which
			
			
			
			
			
			one vs. which
			
			
			
			
			
			any vs. which
			
			
			
			
			
			this vs. which
			
			
			
			
			
			chich vs. which
			
			
			
			
			
			which vs. wizard
			
			
			
			
			
			such vs. which
			
			
			
			
			
			wherethrough vs. which
			
			
			
			
			
			unattackable vs. which
			
			
			
			
			
			attackable vs. which
			
			
			
			
			
			which vs. wish
			
			
			
			
			
			how vs. which
			
			
			
			
			
			they vs. which
			
			
			
			
			
			where vs. which
			
			
			
			
			
			thar vs. which
			
			
			
			
			
			which vs. with
			
			
			
			
			
			whereby vs. which
			
			
			
			
			
			whereinto vs. which
			
			
			
			
			
			whereon vs. which
			
			
			
			
			
			also vs. which
			
			
			
			
			
			coulisse vs. which
			
			
			
			
			
			soever vs. which
			
			
			
			
			
			whereupon vs. which
			
			
			
			
			
			whereof vs. which
			
			
			
			
			
			which vs. witch
			
			
			
			
			
			which vs. whom
			
			
			
			
			
			wherefore vs. which
			
			
			
			
			
			which vs. whichsoever
			
			
			
			
			
			which vs. whichever
			
			
			
			
			
			which vs. who
			
			
			
			
			
			interrogative vs. which
			
			
			
			
			
			which vs. wich
			
			
			
			
			
			which vs. whose
			
			
			
			
			
			what vs. which
			
			
			
			
			
			that vs. which