xenoglossia

/ ˈzɛnəˌɡlɒsɪ; ˌzɛnəˈɡlɒsɪə /

noun

1. an ability claimed by some mediums, clairvoyants, etc, to speak a language with which they are unfamiliar

Word History and Origins

Origin of xenoglossia¹

C20: from Greek, from xeno- + Attic Greek glossa tongue, language