echolalia

noun

1. (countable, uncountable)The involuntary repetitive echoing of words or phrases spoken by another person; either immediate or delayed.

   “Their echolalic responses may be much more extensive than the single words or short phrases that are characteristic of normal echolalia. Thus, a pseudoverbal autistic child may respond to "Do you want a cookie, Jimmy?" with a replication of the very same words.”

2. (countable, uncountable)An infant's repetitive imitation of vocal sounds spoken by another person, occurring naturally during childhood development.
3. (countable, uncountable)Any apparently meaningless, repetitious noises, especially voices.

   “There was the boom of a bass drum, and the voice of the orchestra leader rang out suddenly above the echolalia of the garden.”