[1] : The Collaborative International Dictionary of English v.0.48

whether \wheth"er\, conj.
   in case; if; -- used to introduce the first or two or more
   alternative clauses, the other or others being connected by
   or, or by or whether. when the second of two alternatives is
   the simple negative of the first it is sometimes only
   indicated by the particle not or no after the correlative,
   and sometimes it is omitted entirely as being distinctly
   implied in the whether of the first.
   1913 webster

         and now who knows
         but you, lorenzo, whether i am yours?    --shak.
   1913 webster

         you have said; but whether wisely or no, let the forest
         judge.                                   --shak.
   1913 webster

         for whether we live, we live unto the lord; and whether
         we die, we die unto the lord; whether we live
         therefore, or die, we are the lord's.    --rom. xiv. 8.
   1913 webster

         but whether thus these things, or whether not;
         whether the sun, predominant in heaven,
         rise on the earth, or earth rise on the sun, . . .
         solicit not thy thoughts with matters hid. --milton.
   1913 webster

   whether or no, in either case; in any case; as, i will go
      whether or no.

   whether that, whether. --shak.
      1913 webster
see also:
whether or no whether that 

Whether >> W Words
Whether, definition of term: Whether
whether_pag1.html

Whether Or No >> W Words
Whether Or No, definition of term: Whether Or No
whether+or+no_pag1.html