glossolalia , n :
Speaking a language one does not know, or speaking elaborate but apparently meaningless speech, while in a trance-like state (or, supposedly, under the influence of a deity or spirits); speaking in tongues. Xenoglossy (“knowledge of a language one has never learned”).
Source http://handbookblogger.blogspot.com/2018/01/glossolalia-word-of-day-for-january-23.html
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