geniality (n.)

1560s, "pertaining to marriage," from Latin genialis "pleasant, festive," originally "pertaining to marriage rites," from genius "guardian spirit," with here perhaps a special sense of "tutelary deity of a married couple," from PIE *gen(e)-yo-, from root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups. Originally used in English in the Latin literal sense; meaning "cheerful, friendly" first recorded 1746. Related: Genially.