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Literally, a joining: in speech, the utterance of the individual sounds of speech in connected discourse; the movements during speech of the organs that modify the stream of voiced and unvoiced breath in meaningful sounds: The speech function performed largely through movements of the mandible, lips, tongue and soft palate.

Definition reprinted with permission from Hood, Stephen B. (editor) available from Stuttering Foundation of America: Stuttering Words (Publication No 2: Speech Foundation of America)