Source : Webster's Revised Unabridged Dictionary (1913)

Halves \Halves\, n.,
   pl. of {Half}.

   {By halves}, by one half at once; halfway; fragmentarily;
      partially; incompletely.

            I can not believe by halves; either I have faith, or
            I have it not.                        --J. H.
                                                  Newman.

   {To go halves}. See under {Go}.