- a form of the possessive case of plural they used as a predicate adjective, after a noun or without a noun: It is theirs.Oh, you know Walt and Liz—are you a friend of theirs?
- a form of the possessive case of singular they used as a predicate adjective, after a noun or without a noun:
- (used to refer to a generic or unspecified person previously mentioned, about to be mentioned, or present in the immediate context): I have my book—does everyone else have theirs?
- (used to refer to a specific or known person previously mentioned, about to be mentioned, or present in the immediate context): The child couldn’t say whether or not the coat was theirs.
- (used to refer to a nonbinary or gender-nonconforming person previously mentioned, about to be mentioned, or present in the immediate context): I've already gotten my coffee, but Morgan is still waiting to get theirs.
- that which belongs to them: The Joneses don't usually flaunt their money, but theirs is the largest house on the block.
- something or someone belonging to or associated in some way with them
- something or someone belonging to or associated in some way with an indefinite antecedent such as one, whoever, or anybody
- belonging to or associated with them
