marriage of convenience noun2 •A marriage motivated by some reason other than love; for example, one conducted to obtain residence rights in a country, for financial gain, or for political purposes. •(figurative) A big tent alliance of disparate factions (such as political factions).Libertarians and the Religious Right make odd bedfellows, but that marriage of convenience in the Republican Party has stuck around since the 1980s. formsmarriages of convenience