Definition of sign language
1
: any of various formal languages employing a system of hand gestures and their placement relative to the upper body, facial expressions, body postures, and finger spelling especially for communication by and with deaf people
But true sign languages are in fact complete in themselves: their syntax, grammar, and semantics are complete, but they have a different character from that of any spoken or written language.— Oliver Sacks Sign language relies mainly on the signer's hand, but facial expressions and body movements are also important.— Mark Prigg
2
: an unsystematic method of communicating chiefly by manual gestures (as by people speaking different languages)
I decided to cadge a lift from a Lebanese who only spoke Arabic, so we had to converse in sign language.— Robert Fox
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Merriam-Webster unabridged
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Time Traveler for sign language
The first known use of sign language was in 1824
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