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sign language

Sign language is defined as a way to communicate using hand gestures and symbols for words or letters of the alphabet, often used by those who are hard-of-hearing.

(noun)

An example of sign language is the means of communicating used by Helen Keller.

See sign language in Webster's New World College Dictionary

communication of thoughts or ideas by means of manual signs and gestures, esp. between two people who have no language in common
a system of signs and gestures used as a language by the deaf

See sign language in American Heritage Dictionary 4

noun

A language that uses a system of manual, facial, and other body movements as the means of communication, especially among deaf people.
A method of communication, as between speakers of different languages, that uses hand movements and other gestures.

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