which
[hwich, wich]
PRONOUN
1.
what one?: Which of these do you want? Which do you want?
2.
whichever; any one that: Choose which appeals to you.
3.
(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.
4.
(used relatively in restrictive clauses having that as the antecedent): Damaged goods constituted part of that which was sold at the auction.
5.
(used after a preposition to represent a specified antecedent): the horse on which I rode.
6.
(used relatively to represent a specified or implied antecedent) the one that; a particular one that: You may choose which you like.
7.
(used in parenthetic clauses) the thing or fact that: He hung around for hours and, which was worse, kept me from doing my work.
8.
who or whom: a friend which helped me move; the lawyer which you hired.
Source: Dictionary.com

en.wikipedia.org/wiki/Definition

A definition is a statement of the meaning of a term Definitions can be classified into two large categories, intensional definitions and extensional definitions ...

www.merriam-webster.com/dictionary/which

Which definition is - being what one or ones out of a group —used as an interrogative. How to use which in a sentence. that, which, or who?

www.merriam-webster.com/dictionary/which%20is%20which

Which is which definition is - —used to say that one is unsure about the identity of each member of a group. How to use which is which in a sentence.

www.collinsdictionary.com/dictionary/english/which

Which definition: You use which in questions when there are two or more possible answers or alternatives . | Meaning, pronunciation, translations and examples.

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Which definition, what one?: Which of these do you want? Which do you want? See more.

www.thefreedictionary.com/which

Define which. which synonyms, which pronunciation, which translation, English dictionary definition of which. pron. 1. What particular one or ones: Which of ...

en.oxforddictionaries.com/definition/which

Definition of which - asking for information specifying one or more people or things from a definite set.

www.macmillandictionary.com/us/dictionary/american/which

Define which (determiner, pronoun) and get synonyms. What is which ( determiner, pronoun)? which (determiner, pronoun) meaning, pronunciation and more by ...

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which definition: The definition of which is what one(s) of those mentioned. ( adjective) An example of which is what book or what shirt....