concubinage

 
Pronunciation: /kɒnˈkjuːbɪnɪdʒ/

noun

[mass noun] chiefly historical
  • the practice of keeping a concubine, or the state of being a concubine: what is the daughter of an infidel good for besides concubinage?

Origin:

late Middle English: from French, from Old French concubine (see concubine)