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English word heir comes from Proto-Indo-European *ǵʰeh₁ro-, and later Latin heres (Heir, heiress.)
*ǵʰeh₁ro- (Proto-Indo-European)
heres (Latin)
Heir, heiress.
heir (Old French)
eir (Old French)
Heir.
eir (Anglo-Norman)
heir (Middle English)
heir (English)
A successor in a role, representing continuity with the predecessor.. One who inherits, or has been designated to inherit, a hereditary title or office.. Someone who inherits, or is designated to inherit, the property of another.