Non-monagamy: an umbrella term for those who do not have one partner
Polyamory: people who have more than on partner in a consensual relationship
Cheating: adultery; one or more members of the relationship does not consent to multiple partners
Polygamy: the marriage of more than two people
Polgyny: one husband with multiple wives; a form of polygamy
Polyandry: one wife with multiple husbands; a form of polygamy
Fraternal polyandry: a specific type of polyandry sometimes found around Tibet and Nepal; a women is married to a set of brothers
Open relationship: when two partners consent to having other sexual partners; swinging, monogamish, Polyamourous, and polyfidelitous relationships can be considered open relationships
Swinging: committed couples who consentually exchange sexual partners for sexual purposes; generally more open to lesbian relations than gay relations; largely heterosexual; can be closes or open
Monogamish: generally monogamous, with varying degrees of consented sexual contact
Polyamory: open, consensual relationships with more than 2 people
Polyfidelity: closed, consensual relationships with more than 2 people; fidelity
Polyaffective: emotionally intimate, nonsexual relations in a Polyamourous relationship
Endogamy: individuals can only marry others of a particular group, suchnas religion
Relationship anarchy: no exact definition; generally critical of a society that has a standard of romantic, sex based relationships over nonromantic/sexual ones; tend to reject any form of rules in the relationship