their
their · pronoun
Definitions
pronoun
- 1.
Belonging to or associated with people or things previously mentioned or easily identified.
- 2.
Used to refer to a person of unspecified gender (singular they).
- 3.
(archaic) Used in titles.
Related words
Etymology
From Old Norse "theirra," the genitive plural of the demonstrative pronoun, which replaced the Old English "hiera." The adoption of Scandinavian pronouns in English occurred during the period of Viking settlement. The singular use for unspecified gender has been common since Middle English.