Oxford Dictionary English sign language nounnoun BrE BrE//ˈsaɪn læŋɡwɪdʒ// ; NAmE NAmE//ˈsaɪn læŋɡwɪdʒ// [uncountable, countable] Add to my wordlistjump to other resultsa system of communicating with people who cannot hear, by using hand movements rather than spoken words They communicate in sign language.See sign language in the Oxford Advanced American DictionaryCheck pronunciation: sign language oxfordlearnersdictionaries.com