Affair Partner
A person with whom one is having an extramarital or unfaithful relationship; the third party in an affair.
Many individuals in infidelity recovery forums refer to the third party as the affair partner.
affair
UK /əˈfɛə/ US /əˈfɛɹ/
noun 5
Definitions
noun
1
Something which is done or is to be done; business of any kind, commercial, professional, or public.
a difficult affair to manage
Responsibility is my affair, reciprocity is his.
2
Any proceeding or action which it is wished to refer to or characterize vaguely.
an affair of honor
an affair of love
3
An action or engagement not of sufficient magnitude to be called a battle.
4
A material object (vaguely designated).
He used a hook-shaped affair with a long handle to unlock the car.
This garden is a ramshackle affair.
5
An adulterous relationship, chiefly of a married person. (from affaire de cœur, affair of the heart).
When Martin's wife found out about his affair with her best friend, she asked for a divorce.
Mary had an affair with a woman from the gym.
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