A separation or goodbye, especially when people leave each other; also the line created by dividing hair in different directions.
From the verb 'part,' which comes from Old French 'partir' (to divide or leave), from Latin 'partire' (to divide). The noun '-ing' form can mean both the action and its result.
The hair meaning of 'parting' comes from the same root as 'partition'—both involve dividing something into parts, so your hair parting is literally a dividing line.
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