(n.) A marriage with a person of inferior rank or social station; an improper alliance; a mesalliance.

a world-without-end bargain abnormality alliance anomaly bed bond of matrimony bridebed cohabitation conjugal bond conjugal knot coverture holy matrimony holy wedlock husbandhood ill-assorted marriage impropriety inadmissibility inapplicability inappositeness inappropriateness inaptitude inaptness infelicity intermarriage interracial marriage invalid linking irrelevance irrelevancy maladjustment marriage marriage bed marriage sacrament match matrimonial union matrimony mesalliance misapplicability misapplication miscegenation misconnection misjoinder misjoining mismatch misreference misrelation mixed marriage nuptial bond sacrament of matrimony spousehood uncongeniality unfitness union unsuitability wedded bliss wedded state weddedness wedding knot wedlock wifehood