American Sign Language
noun
                                
              
          
                                                      : a sign language that is used especially for communication by and with deaf people and is the formal sign language of the United States and English-speaking Canada and also serves as the basis for various sign languages in other countries (such as Thailand, Nigeria, and Bolivia)                                      
                
                  —abbreviation ASL
    
                
Note: American Sign Language was developed in Hartford, Connecticut in the early 1800s.
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  Merriam-Webster unabridged




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