cohabitation

noun 0.688

cohabitee

noun 0.617

companionate marriage

noun 0.606

cohabitant

noun 0.601

common-law marriage

noun 0.595

cuckoldry

noun 0.561

wedlock

noun 0.560

nonmarriage

noun 0.552

marriage

noun 0.545

civil partnership

noun 0.545

polygyny

noun 0.541

coition

noun 0.537

cony

noun 0.537

polyandry

noun 0.536

condominium

noun 0.531

domestic partnership

noun 0.530

marriage of convenience

noun 0.524

coresidence

noun 0.522

nonmarried

noun 0.522

nonmonogamy

noun 0.517

bigamy

noun 0.512

bachelorhood

noun 0.512

servitude

noun 0.512

civil marriage

noun 0.507

consanguinity

noun 0.505

courtesan

noun 0.504