Etymology
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echolalia (n.)

"meaningless repetition of words and phrases," 1876, from German (von Romberg, 1865), from Greek ekho (see echo (n.)) + lalia "talk, prattle, a speaking," from lalein "to speak, prattle," of echoic origin.

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Definitions of echolalia

echolalia (n.)
an infant's repetition of sounds uttered by others;
echolalia (n.)
(psychiatry) mechanical and meaningless repetition of the words of another person (as in schizophrenia);
From wordnet.princeton.edu