conj. 1.  Used in indirect questions to introduce one alternative: We should find out whether the museum is open. See Usage Notes at  doubt,  if. 2.  Used to introduce alternative possibilities: Whether she wins or whether she loses, this is her last tournament. 3.  Either: He passed the test, whether by skill or luck. pron.  Idiom: Archaic  Which: "We came in full View of a great Island or Continent, (for we knew not whether)" (Jonathan Swift).  whether or no  Regardless of circumstances.  | 
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