Rac`e·ma'tion (răs`e*mā'shŭn) noun [ Latin racematio a gleaning, from racemari to glean, racemus a cluster of grapes. See Raceme .] 1. A cluster or bunch, as of grapes. Sir T. Browne. 2. Cultivation or gathering of clusters of gr... Found on http://www.encyclo.co.uk/webster/R/2