from The American Heritage® Dictionary of the English Language, 4th Edition
- pro. What particular one or ones: Which of these is yours?
- pro. The one or ones previously mentioned or implied, specifically:
- pro. Used as a relative pronoun in a clause that provides additional information about the antecedent: my house, which is small and old.
- pro. Used as a relative pronoun preceded by that or a preposition in a clause that defines or restricts the antecedent: that which he needed; the subject on which she spoke.
- pro. Used instead of that as a relative pronoun in a clause that defines or restricts the antecedent: The movie which was shown later was better.
- pro. Any of the things, events, or people designated or implied; whichever: Choose which you like best.
- pro. A thing or circumstance that: He left early, which was wise.
- adj. What particular one or ones of a number of things or people: Which part of town do you mean?
- adj. Any one or any number of; whichever: Use which door you please.
- adj. Being the one or ones previously mentioned or implied: It started to rain, at which point we ran.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- What, of those mentioned or implied (used interrogatively).
- What one or ones (of those mentioned or implied).
- The one or ones that.
- the one mentioned
- Used of people (now generally who, whom or that).
- pro. Who; whom; what (of those mentioned or implied)
- n. An occurrence of the word which.
from the GNU version of the Collaborative International Dictionary of English
- pro. Of what sort or kind; what; what a; who.
- pro. 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; See the Note under What, pron., 1.
- pro. 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.
- pro. A compound relative or indefinite pronoun, standing for any one which, whichever, that which, those which, the … which, and the like.
from The Century Dictionary and Cyclopedia
- A. interrog. What one of a certain implied number or set? indicating a general knowledge of a certain group of individuals, and seeking for a selection of one or more from that number: thus, which do you want? implying a limitation which is absent from the question what do you want?
- B. rel. As a simple relative pronoun: Who or whom.
- Used with, reference to things, and to creatures not persons: the antecedent may also be a phrase or a clause: as, the rain washed away the track, which delayed the train.
- As a compound relative pronoun, having the value of both antecedent and relative: as, you can determine which is better (that is, you can determine that, or the one, which is better).
- Which is used adjectively:
- With the sense of ‘what sort of.’
- As indicating one of a number of known or specified things: as, be careful which way you turn.
- [Which was formerly used as a clause-connective, along with a personal pronoun which took its place as subject or object, and rendered it redundant save as in its relative value: as, which … he = who; which … his = whose.
- A relic of this construction survives in the vulgar use of which as a general introductory word.
- Which was formerly often followed by that or as, having the effect of giving emphasis or definiteness.
- Redundant for which.
- n. A chest.
- n. Specifically, a movable wagon-box.
Middle English, from Old English hwilc.(American Heritage® Dictionary of the English Language, Fourth Edition)
Old English hwilc, from Proto-Germanic *hwi- + *-līkaz, the former being the stem of *hwaz. Cognates include German welcher, Dutch welk and Old Norse hvílíkr. (Wiktionary)