sign language

Also called sign. any of several visual-gestural systems of communication, especially employing manual gestures, as used among deaf people.
any means of communication, as between speakers of different languages, using gestures.

1840–50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sign language
1.  another word for signing
2.  any system of communication by manual signs or gestures

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Dogs and horses can learn to respond to vocal commands, and some apes can be
  taught a primitive sign language.
Some evidence points to hand sign language as our first language.
Researchers develop software that compresses data, allowing real-time video to
  be used to convey sign language over mobiles.
Other research has shown that sign language uses some of the same brain
  machinery that hearing people use for speech.
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