arete (n.1)

"sharp crest of a mountain," 1862, from Swiss French arête, Old French areste, from Latin arista "ear of grain, the top of an ear," in Medieval Latin also "backbone of a fish; exterior angle of a house," which perhaps is of Etruscan origin. The figure is of something jagged.

arete (n.2)

important concept in Greek philosophy, "rank, nobility, moral virtue, excellence," especially of manly qualities; literally "that which is good," a word of uncertain origin.

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Definitions of arete from WordNet

arete (n.)
a sharp narrow ridge found in rugged mountains;