A Life partner is a synonym for a spouse. The phrase can refer to a member of a heterosexual marriage, but is more often used to refer to a same-sex couple. Look up Synonym in Wiktionary, the free dictionary Synonyms (in ancient Greek syn συν = plus and onoma όνομα = name) are different words with similar or identical meanings and are interchangable. ... Heterosexuality is a sexual orientation characterized by esthetic attraction, romantic love or sexual desire exclusively for members of the opposite sex or gender, contrasted with homosexuality and distinguished from bisexuality and asexuality. ... The examples and perspective in this article or section may not represent a worldwide view. ... A same-sex couple is a pair of people of the same sex, who pursue a relationship similar to that of a heterosexual married couple. ...