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"Their" represents possessive.

INCORRECT: "There service is good."
INCORRECT: "They're service is good."
CORRECT: "Their service is good."
by Max Hand June 12, 2004
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Damn that was a steezy ass kickflip son!
by niggaliciouszor April 29, 2007
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Favourite way for internet retards to spell the contraction "they're" or they are.
A: ohemefgee my parents are teh sux
B: yeah me 2, their being bitches
by JyL. September 10, 2005
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Traditionally used as a plural possessive pronoun, "their" has come to be a shorthand for saying "his or her."

Before the women's rights movements in the U.S. it was considered acceptable to say "his" when the gender of a person was unknown but women took offense to this and demanded that people say "his or her" instead. This idea was adopted for a while, and it was common to see people writing shorthands such as "his/her," but people eventually grew tired of this and started saying "their" instead. It was not long before English professors and teachers became upset by the new trend, and to this day you can still hear them scream when you use it in a paper, but that's really okay because it's their fault for making us say "his or her" instead of "his."
No one can outrun their destiny.
by Ribsa June 04, 2007
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Singular possesive(formerly plural). Used in place of "his," "hers," or "his/her."
A person has to keep an eye on their things when riding the subway.

If the driver changes lanes, they have to signal two hundred feet beforehand by state law.
by Feminism February 09, 2014
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