Source : Webster's Revised Unabridged Dictionary (1913)

Cosmos \Cos"mos\, n. (Bot.)
   A genus of composite plants closely related to {Bidens},
   usually with very showy flowers, some with yellow, others
   with red, scarlet, purple, white, or lilac rays. They are
   natives of the warmer parts of America, and many species are
   cultivated. {Cosmos bipinnatus} and {C. diversifolius} are
   among the best-known species; {C. caudatus}, of the West
   Indies, is widely naturalized.

Cosmos \Cos"mos\ (k[o^]z"m[o^]s), n. [NL., fr. Gr. ko`smos
   order, harmony, the world (from its perfect order and
   arrangement); akin to Skr. [,c]ad to distinguish one's self.]
   1. The universe or universality of created things; -- so
      called from the order and harmony displayed in it.

   2. The theory or description of the universe, as a system
      displaying order and harmony. --Humboldt.

Source : WordNet®

cosmos
     n 1: everything that exists anywhere; "they study the evolution
          of the universe"; "the biggest tree in existence" [syn:
          {universe}, {existence}, {creation}, {world}, {macrocosm}]
     2: any of various mostly Mexican herbs of the genus Cosmos
        having radiate heads of variously colored flowers and
        pinnate leaves; popular fall-blooming annuals [syn: {cosmea}]