noun as in strong fondness

Strongest matches

cohabitation, marital union

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Example Sentences

Example:They have entered into a long-term cohabitation agreement, having been in concubitancy for over a decade.

Definition:The act of living together as a couple without marriage; joint marital existence.

From cohabitation

Example:Though they were in concubitancy, they considered their relationship more of a marital union than a cohabitation.

Definition:The state of being legally or informally married to a single partner.

From marital union