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Polite manner in referring to a spouse or partner while in the process of separating and/or waiting for a divorce. Also can be used in reference to all in-laws including, parents, brothers and sisters cousins etc.
My future-former (ie wife/husband) asked me to pay for dinner.

I will attend my future-former father-in-law's birthday dinner.
by Walter P Brzozowicz August 09, 2006
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