Their Definition
thâr
adjective
Used as a modifier before a noun.
Their accomplishments; their home town.
American Heritage
His, her, or its.
American Heritage
Of, belonging to, made by, or done by them.
Did everybody finish their lunch?
Webster's New World
pronoun
(possessive) Belonging to, from, of, or relating to, them.
They will meet tomorrow at their convenience; this is probably their cat.
Wiktionary
(possessive) Belonging to someone of unspecified gender.
Wiktionary
Origin of Their
-
Middle English from Old Norse theira theirs to- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
From Middle English, form Old Norse.
From Wiktionary
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