Definition of Which:

part of speech: adjective

Which was often formerly preceded by the definite article the. That worthy name by the which ye are called.

part of speech: pronoun

Used in relation to things, and demonstratively and interrogatively, both for persons and things, as, " the tree which," " which man?".

part of speech: adjective

James ii. 7. It was formerly open followed by that or as, having the effect of giving emphasis or definiteness. “ This abbot which that was an holy ma.”- Chaucer.

part of speech: pronoun

An interrogative; as, which is your house? a relative, meaning a particular one; the one that; as, point out which is yours; used of animals, ideas, or things.

part of speech: adjective

Interrogative; as, which house is yours?.

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A first or main principle; one of the main parts of the physical world, as fire, water, air, etc.; natural environment, or life with which one is familiar; as, he is out of his element; ingredient; in chemistry, a substance which cannot be separated into other substances. ...