theypronoun
people or thingsused as the subject of a sentence to refer to two or more people or things already mentioned or clear from context
They is the subject form; the object form is them, the possessive determiner is their, and the independent possessive is theirs.
any genderused as the subject of a sentence to refer to a single person whose sex is not stated or not known, or who is neither male nor female
This use, often called singular they, is now the standard neutral choice for a person referred to in general terms, whose sex is unknown or not to be assumed, or who identifies outside the categories of male and female and uses they for themselves. It takes a plural verb even when it refers to one person: they are, not they is.
Word family
Usage
The singular use of they (sense 2) is now the standard neutral choice both for a person of unstated or unknown sex and for a person who identifies outside male and female, replacing the older generic use of he (see he, sense 2).
Common mistakes
See also them; their; theirs; he (the older generic use of he, now widely avoided)