domain (n.) Look up domain at Dictionary.com
early 15c., in Scottish, from Middle French domaine "domain, estate," from Old French demaine "lord's estate," from Latin dominium "property, dominion," from dominus "lord, master, owner," from domus "house" (from PIE root *dem- "house, household"). Form influenced in Old French by Medieval Latin domanium "domain, estate." Internet domain name attested by 1985.