the automatic repetition by someone of words spoken in his or her presence, esp. as a symptom of mental disorder
See echolalia in American Heritage Dictionary 4
(ĕkˌō-lāˈlē-ə)
noun
Psychiatry The immediate and involuntary repetition of words or phrases just spoken by others, often a symptom of autism or some types of schizophrenia.
An infant's repetition of the sounds made by others, a normal occurrence in childhood development.