The Collaborative International Dictionary of English v.0.48:

Racemation \Rac`e*ma"tion\ (r[a^]s`[-e]*m[=a]"sh[u^]n), n. [L.
   racematio a gleaning, fr. racemari to glean, racemus a
   cluster of grapes. See Raceme.]
   1. A cluster or bunch, as of grapes. --Sir T. Browne.
      [1913 Webster]

   2. Cultivation or gathering of clusters of grapes. [R.] --Bp.
      Burnet.
      [1913 Webster]