Source : Webster's Revised Unabridged Dictionary (1913)

   3. (Bot.) Belonging to the order {Composit[ae]}; bearing
      involucrate heads of many small florets, as the daisy,
      thistle, and dandelion.

   {Composite carriage}, a railroad car having compartments of
      different classes. [Eng.]

   {Composite number} (Math.), one which can be divided exactly
      by a number exceeding unity, as 6 by 2 or 3.

Source : WordNet®

composite number
     n : an integer that is divisible without remainder by at least
         one positive integer other than itself and one