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The first says “open relationship” is an umbrella term that encapsulates all other forms of nonmonogamy, like monogam-ish, swingers, and polyamory.
The second (and more common) definition, says that open relationships are one type of nonmonogamous relationship under the Ethical Nonmonogamous umbrella.
Here, usually, open relationships are thought to occur between two people in a primary relationship who have agreed to open up their relationship sexually – but not romantically.
So, while “open relationship” always suggests that the relationship exists outside the One Person Is My Everything framework (aka monogamy), to find out exactly what someone means by it, you gotta ask.
“Polyamory is the practice of, or desire for, having a loving and/or intimate relationship with more than one person at a time, with the consent of all people involved.”