The phenomenon of speaking in languages one doesn't know, believed by some to be a spiritual gift; rapid, often meaningless speech sounds.
From Greek 'glossa' (tongue) + 'lalia' (speech, babbling). The term entered English through New Testament Greek, describing early Christian religious practice.
Glossolalia appears in ancient Greek texts, medieval mysticism, and modern Pentecostal Christianity—neuroscientists now study it as a real neurological state different from ordinary speech, fascinating both to believers and skeptics.
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