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Meaning of polysynthesism

pol•y•syn•the•sism

Pronunciation: (pol"i-sin'thu-siz"um), [key]
— n.
  1. the synthesis of various elements.
  2. the combining of several words of a sentence into one word.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.