spouslet (noun) -- Someone who rejects the labeling and legal issues of marriage, domestic partner and/or significant other, but lives with another and, in all respects, acknowledges and acts as a person committed to a monogamous relationship.

spouslets (non) --A couple who rejects the labeling and legal issues of marriage, domestic partner and/or significant other, but lives with another and, in all respects, acknowledges and acts as a person committed to a monogamous relationship.
No, that's not my wife; she's my spouslet.
They're not married but they refer to themselves and each other as spouslets!
by Wordsmith University September 5, 2015
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