[sign language] n (1847) 1: a formal language employing a system of hand gestures for communication (as by the deaf)
2: an unsystematic method of communicating chiefly by manual gestures used by people speaking different languages
[sign language] n (1847) 1: a formal language employing a system of hand gestures for communication (as by the deaf)
2: an unsystematic method of communicating chiefly by manual gestures used by people speaking different languages
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012