Source : Webster's Revised Unabridged Dictionary (1913)

Flirtation \Flir*ta"tion\, n.
   1. Playing at courtship; coquetry.

            The flirtations and jealousies of our ball rooms.
                                                  --Macaulay.

Source : WordNet®

flirtation
     n : playful behavior intended to arouse sexual interest [syn: {flirt},
          {flirting}, {coquetry}, {dalliance}, {toying}]