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- DictionarySign lan·guage/ˈsīn ˌlaNGɡwij/
noun
- 1. a system of communication using visual gestures and signs, as used by deaf people.
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noun
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Sign languages (also known as signed languages) are languages that use the visual-manual modality to convey meaning, instead of spoken words. Sign languages are expressed through manual articulation in combination with non-manual markers. Sign languages are full-fledged natural languages with their own grammar and lexicon. Sign languages are not universal and are usually not mutually intelligible,... Wikipedia