glossolalia

noun2

1. •
   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.

   • Lorenzo is still kneeling at the box, once more Luisa wipes her eyes, Violeta is sobbing and rocking, her glossolalia now at the -sə-sə-sə-level of near exhaustion. — 1982
2. •
   Synonym of xenoglossy (“knowledge of a language one has never learned”).