Русско-англо-русский юридический словарь

A Prenuptial Agreement (often referred to as a “prenup”) is an agreement entered into by a couple before they get married setting out how they will organise their finances during the marriage and what they would wish to happen in relation to financial matters in the unhappy event of a divorce. (prenups.uk.com)

Divorce (or the dissolution of marriage) is the termination of a marital union, the canceling and/or reorganizing of the legal duties and responsibilities of marriage, thus dissolving the bonds of matrimony between a married couple under the rule of law of the particular country and/or state. (Wikipedia)

A marriage certificate is an official statement that two people are married. In most jurisdictions, a marriage certificate is issued by a government official only after the civil registration of the marriage. (Wikipedia)

Cohabitation is an arrangement where two people who are not married live together in an emotionally and/or sexually intimate relationship on a long-term or permanent basis. (Wikipedia)