A. interrog. Which (of two)? which one?B. rel. (always in compound relative use, or with the antecedent implied, not expressed). Which (of two, or, less exactly, of more than two).A. interrog. Which (of two. or of the two)? which one (of two)?B. rel. Which (of two); which one (of two); also, more indefinitely, whichever.In troducing the first of two direct (alternative) questions, the second being introduced by or (literally, which of those two things [is true]?).Introducing a single direct question, the al ternative being unexpressed, and sometimes only dimly implied.Introducing the first of two (or more) alternatives, the second being intro duced by or (or or whether).Introducing a single alternative, the other being implied: as, I do not know whether he is yet goneSee no.An obsolete form of whither.