(interrogative) What one or ones (of those mentioned or implied). Example: By now, you must surely know which is which.
The/Any ones that; whichever. Example: Please take which you please.
(relative) Introduces a relative clause giving further information about something previously mentioned. Example: He had to leave, which was very difficult.
(relative) Used of people (now generally who, whom or that).
All clues having "WHICH"
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You can find a list of possible crossword clues for WHICH below.