which /ˈhwɪʧ, ˈwɪʧ/
1. Of what sort or kind; what; what a; who. [Obs.]
And which they weren and of what degree. --Chaucer.
2. 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.
Which of you convinceth me of sin? --John viii. 46.
3. 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.
And when thou fail'st -- as God forbid the hour! --
Must Edward fall, which peril heaven forfend! --Shak.
God . . . rested on the seventh day from all his work which he had made. --Gen. ii. 2.
Our Father, which art in heaven. --Matt. vi. 9.
The temple of God is holy, which temple ye are. --1 Cor. iii. 17.
4. 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.
Note: ☞ The which was formerly often used for which. The expressions which that, which as, were also sometimes used by way of emphasis.
Do not they blaspheme that worthy name by the which ye are called? --James ii. 7.
Note: ☞ Which, referring to a series of preceding sentences, or members of a sentence, may have all joined to it adjectively. “All which, as a method of a proclamation, is very convenient.” --Carlyle.