Etymology

someone's

some·one's

Today it means: Possessive case of someone. Full definition →

English someone ← Middle English sum oon
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someone's · pronoun1

  1. Middle Englishsum oon
  2. Englishsomeone
  3. English todaysomeone's

From someone + -'s.

someone's · contraction2

From someone + 's.

Etymology from Wiktionary, CC BY-SA 4.0.