Etymology

theirs

T1H4E1I1R1S1

Today it means: That or those belonging to them; the possessive case of they, used without a following noun. Full definition →

Middle English theires
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The story

  1. Middle English · inherited fromtheires
  2. English todaytheirs

From Middle English theires, attested since the 1300s. Equivalent to their + -s (compare -'s); formed by analogy to his. Displaced theirn (from Middle English theiren, formed by analogy to mine, thine) in standard speech.

Etymology from Wiktionary, CC BY-SA 4.0.