D defs.my
Entry 2 senses Webster, 1913

Concubine

/kän'-kyəb-īnˌ/ · Con·cu·bine · IPA /ˈkɑŋkjəbaɪn/
01 n. A woman who cohabits with a man without being his wife; a paramour.
  1. 1.
    A woman who cohabits with a man without being his wife; a paramour.
  2. 2.
    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.