Source : Webster's Revised Unabridged Dictionary (1913)

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.

         And now who knows But you, Lorenzo, whether I am yours?
                                                  --Shak.

         You have said; but whether wisely or no, let the forest
         judge.                                   --Shak.

         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.

         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.

   {Whether or no}, in either case; in any case; as, I will go
      whether or no.

   {Whether that}, whether. --Shak.