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1560s, "pertaining to marriage," from Latin genialis "pleasant, festive," literally "pertaining to marriage rites," from genius "guardian spirit" (see genius). Originally used in the Latin literal sense; meaning "cheerful, friendly" first recorded 1746. Related: Genially.
genial ge·ni·al (jĭ-nī'əl) or ge·ni·an (-ən)
Of or relating to the chin.