echolaliaPronunciation: /ˌɛkəʊˈleɪlɪə/Definition of echolalia noun [mass noun] 1 Psychiatry meaningless repetition of another person’s spoken words as a symptom of psychiatric disorder. 2repetition of speech by a child learning to talk. Origin: late 19th century: modern Latin, from Greek ēkhō 'echo' + lalia 'speech'echolalia in other Oxford dictionaries Definition of echolalia in the US English dictionary