Русско-англо-русский юридический словарь

A sham marriage or fake marriage is a marriage of convenience entered into purely for the purpose of gaining a benefit or other advantage arising from that status. (Wikipedia)

A marriage of convenience (plural marriages of convenience) is a marriage contracted for reasons other than that of relationship, family, or love. Instead, such a marriage is orchestrated for personal gain or some other sort of strategic purpose, such as political marriage. (Wikipedia)