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In a relationship. Used especially to mean claims of being in a relationship on an online social networking web site such as Facebook.
"I just noticed on Facebook that Emma is IAR now."

"James claims to be IAR, but I think he has a Canadian girlfriend."
by Michael in Cambridge November 02, 2007
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Abbreviation for "In a round..."
Airborne Ribbon
* IAR: 10 seconds in a Parachute
--(Battlefield 2)
by Bankai December 17, 2005
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