their

[ thair; unstressed ther ]

pronoun

1. a form of the possessive case of plural they used as an attributive adjective, before a noun:

   their home;

   their rights as citizens;

   their departure for Rome.

2. a form of the possessive case of singular they used as an attributive adjective, before a noun:
   1. (used to refer to a generic or unspecified person previously mentioned, about to be mentioned, or present in the immediate context): A parent should read to their child.

      Someone left their book on the table.

      A parent should read to their child.

   2. (used to refer to a specific or known person previously mentioned, about to be mentioned, or present in the immediate context):

      I’m glad my teacher last year had high expectations for their students.

   3. (used to refer to a nonbinary or gender-nonconforming person previously mentioned, about to be mentioned, or present in the immediate context):

      My cousin Sam is bad at math, but their other grades are good.

their

/ ðɛə /

determiner

1. of, belonging to, or associated in some way with them

   she tried to combat their mocking her

   their own clothes

   their finest hour

2. belonging to or associated in some way with people in general not including the speaker or people addressed

   in many countries they wash their clothes in the river

3. belonging to or associated in some way with an indefinite antecedent such as one, whoever, or anybody

   everyone should bring their own lunch

Usage

See they

Grammar Note

See he ¹, me, they.

Word History and Origins

Origin of their¹

First recorded in 1150–1200; Middle English their(e), ther(e), from Old Norse theirra “their”; replacing Old English thāra, thǣra; they

Word History and Origins

Origin of their¹

C12: from Old Norse theira (genitive plural); see they , them

Example Sentences

The force that inspires defiant videos and top-of-their-lungs screeching tweens is, in fact, a media-shy 43-year old Swedish… man.

From The Daily Beast

There were housing projects, and some truly derelict hotels where the very-down-on-their-luck lived.

From The Daily Beast

Issa is in the Republicans-lost-their-way camp, saying his party spent way too much in the Bush years.

From The Daily Beast

One daring exception to this lineup of standees-by-their men was the second wife of Newt Gingrich.

From The Daily Beast

I call that one: The Canadians-Are-Indeed-Nicer-and-Their-Side-of-the-Falls-More-Spectacular-Too One.

From The Daily Beast

Again Rome had to gasp for breath, and again the two were fiercely locked-their corded arms as tense as serpents.

From Project Gutenberg

We may, however, settle it that Mr. Plan-others-their-work could put all the harvest he ever had in his waistcoat pocket!

From Project Gutenberg

Such was the education of the Spartans with regard to one of the greatest of their-kings.

From Project Gutenberg

Oak, hickory and beech—clean, vast, in-their-prime forest-men—with thorn and dogwood growing between.

From Project Gutenberg

In our desperate state, anything seemed fair in love or war with such hard, worth-their-weight-in-gold people.

From Project Gutenberg