Etymology

their

T1H4E1I1R1

Today it means: Belonging to, from, of, or relating to, them (plural). Full definition →

Old Norse þeira ← Proto-Norse ᚦᚨᛁᛉᛟ (þaiʀo /⁠þaizō⁠/) ← Proto-Germanic *þaizǭ
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The story

  1. Proto-Germanic*þaizǭ
  2. Proto-Norseᚦᚨᛁᛉᛟ (þaiʀo /⁠þaizō⁠/)
  3. Old Norseþeira
  4. English todaytheir

From Old Norse þeira, þeirra. Replaced native Old English heora.

Etymology from Wiktionary, CC BY-SA 4.0.