theirs

The word “theirs” means the thing or things belonging to them (used without a following noun). In plain terms, the possessive form of "they" used on its own, without a noun right after it — compare "their car" with "the car is theirs.".

“Theirs” is pronounced theh-uhz (/ðɛɚz/ in IPA).

Here is “theirs” used in a sentence: “This car is theirs, not ours.”

“Theirs” is a pronoun.

The word “theirs” comes from Middle English. From Middle English theires, formed from "their" plus "-s," on the model of "his.".

“Theirs” is a fairly common word in modern English, usually learned at around the A2 level.

'Their' is a possessive determiner and must come before a noun, as in 'their car.' 'Theirs' is a possessive pronoun that stands alone in place of the noun, as in 'the car is theirs.' Use 'theirs' when the thing owned is already clear and you do not want to repeat it.

No. 'Theirs' is never written with an apostrophe, so 'their's' is always incorrect. Like 'ours,' 'yours,' and 'hers,' it is already possessive and needs no apostrophe.

'Theirs' is a possessive pronoun meaning the thing belonging to them, as in 'that seat is theirs.' 'There's' is a contraction of 'there is' or 'there has,' as in 'there's a seat free.' They sound alike but are never interchangeable.

Yes. Although 'theirs' is traditionally plural, it is now widely accepted as a singular, gender-neutral possessive, as in 'someone left theirs behind.' Used this way it avoids specifying whether the owner is male or female. This singular use is common in modern English.