variants:
or less commonly prenup
or prenuptial
Definition of prenuptial agreement
: an agreement made between two people before marrying that establishes rights to property and support in the event of divorce or death
Prenuptial agreements have long been used by couples who want to set down the terms of any future divorce before they walk down the aisle.— Desa Philadelphia Even though there's a prenup, it's unclear how much of Liz's money Fortensky will end up with … — Newsweek
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Merriam-Webster unabridged
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Time Traveler for prenuptial agreement
The first known use of prenuptial agreement was in 1882
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