Top Definition
unfaithfulness to a sexual partner.
Lack of loyalty or religious belief
by Mmm SeanPaul September 25, 2003

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Going outside of a monogomous relationship for sexual intercourse, companionship, or attention. Cheating.
Infidelity is a nicer way of saying my wife makes my tuna with other guys' mayonaise?
by needmaps March 08, 2012

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a threesome you weren't invited to
She said she wasn't committing an infidelity, just that I wasn't invited to this ménage à trois. She promises she'll take me alpine skiing with the next guy she picks up.
by partytrap February 24, 2013

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s a violation of a couple's assumed or stated contract regarding emotional and/or sexual exclusivity
most marriages end due to infidelity
by AOHARURIDE October 25, 2015

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The state of being unfaithful, to either a partner, friend, co-worker, etc.
Kim: Did you hear that John cheated on Karen?
Sue: Yeah, John has some serious infidelity issues.
by suppakool#20 December 07, 2011

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

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