Meaning

originLearned borrowing from Old English esne, from Proto-West Germanic *asnī, from Proto-Germanic *asnijaz (“day labourer, hireling”), from Proto-Germanic *asniz, *asunz (“reward”), from Proto-Indo-European *os(e)n-, *es(e)n- (“summer, harvest, harvest-time”). Related to Old English earnian (“to labor for, strive after, deserve as the reward of labor, merit, earn, win”). More at earn.

Etymology from Wiktionary, CC BY-SA 3.0