Source : Webster's Revised Unabridged Dictionary (1913)

Agreeability \A*gree`a*bil"i*ty\, n. [OF. agreablete.]
   1. Easiness of disposition. [Obs.] --Chaucer.

   2. The quality of being, or making one's self, agreeable;
      agreeableness. --Thackeray.

Source : WordNet®

agreeability
     n : a temperamental disposition to be agreeable [syn: {agreeableness}]
         [ant: {disagreeableness}]