Glossolalia or speaking in tongues, according to linguists, is the fluid vocalizing of speech-like syllables that lack any readily comprehended meaning, in some cases as part of religious practice in which it is believed to be a divine language unknown to the speaker. The term derives from glōssais lalō, a Greek phrase used in the New Testament meaning "speak in, with, or by tongues [i.e., other languages]" (1 Corinthians 14:18). The related term “xenolalia” or "xenoglossy" is used to describe the phenomenon when the language being spoken is a natural language previously unknown to the speaker. Glossolalia is practiced in Pentecostal and Charismatic Christianity as well as in other religions.