xenolalia means the ability to speak in a language which the individual has not learned. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
xenolalia is pronounced /ˌzinoʊˈleɪliə/.
Why “xenolalia” is a great word
The paranormal ability to speak fluently in a language which the speaker has never been taught. From the Greek xeno- ("foreign") and -lalia ("speaking, talk"), the term first appeared in 1978 in the writing of D. Christie-Murray. Unlike glossolalia, which signifies ecstatic, unintelligible utterance taken as a spiritual tongue, or xenoglossy, its more common synonym, xenolalia carries the chillier precision of clinical observation. It is the inexplicable fluency of a farmhand recounting his past life in flawless Babylonian, the sudden, grammatical German issuing from a sleeping child, or the perfect accent emerging from a tongue that has never shaped its sounds—a phenomenon that terrifies not by its strangeness, but by its impossible, immaculate correctness, suggesting a self untethered from its own biography.
Etymology
From xeno- + -lalia.
noun
- The ability to speak in a language which the individual has not learned.