Cŏn'cu-bīne, n.
(kŏŋk'yu-bīn, 82), n. [Fr. concubine, Pr. concubina, Lat. concubinus, m., and concubina, f., from concubare, to lie together, from con and cubare, to lie down.]
Sense 1. A woman who cohabits with a man without being his wife.
Sense 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.
☞ Concubine has been sometimes, but rarely, used of a male paramour as well as of a female. Trench.