1560s, "pertaining to marriage," from Latin genialis "pleasant, festive," literally "pertaining to marriage rites," from genius "guardian spirit" (see genius), with here perhaps a special sense of "tutelary deity of a married couple." Originally used in English in the Latin literal sense; meaning "cheerful, friendly" first recorded 1746. Related: Genially.[genial etymology, genial origin, 英语词源]