قاموس اللغة الإنجليزية

A woman who cohabits with a man without being his wife; a paramour.

A wife of inferior condition; a lawful wife, but not united to the man by the usual ceremonies, and of inferior condition. Such were Hagar and Keturah, the concubines of Abraham; and such concubines were allowed by the Roman laws. Their children were not heirs of their father.