Source : Webster's Revised Unabridged Dictionary (1913)

Corollary \Cor"ol*la*ry\ (k?r"?l-l?-r?; 277), n.; pl.
   {Corollaries} (-r?z). [L. corollarium gift, corollary, fr.
   corolla. See {Corolla}.]
   1. That which is given beyond what is actually due, as a
      garland of flowers in addition to wages; surplus;
      something added or superfluous. [Obs.]

            Now come, my Ariel; bring a corollary, Rather than
            want a spirit.                        --Shak.

   2. Something which follows from the demonstration of a
      proposition; an additional inference or deduction from a
      demonstrated proposition; a consequence.

Source : WordNet®

corollary
     n 1: a practical consequence that follows naturally; "blind
          jealousy is a frequent corollary of passionate love"
     2: (logic) an inference that follows directly from the proof of
        another proposition