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their

The definition of their is a person or thing that belongs to or was made by them.

(adjective)

An example of their is a sister of two siblings.
An example of their is a book written by two authors.

See their in Webster's New World College Dictionary

possessive pronominal adjective

of, belonging to, made by, or done by them: also used before some formal titles [Their Majesties]: often used in connection with a preceding singular pronoun (as everybody, somebody, everyone): did everybody finish their lunch?

Origin: ME theyr < ON theirra, gen. pl. of the demonstrative pron. replacing ME here, OE hira: see they

See their in American Heritage Dictionary 4

adjective The possessive form of they.

Used as a modifier before a noun: their accomplishments; their home town.
Usage Problem His, her, or its: “It is fatal for anyone who writes to think of their sex” (Virginia Woolf). See Usage Notes at he¹, they.

Origin:

Origin: Middle English

Origin: , from Old Norse theira, theirs; see to- in Indo-European roots

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