Definition of "concubine"

And that is more than I will yield unto: / I know I am too mean to be your queen, / And yet too good to be your concubine.

c. 1591–1592 (date written), William Shakespeare, “The Third Part of Henry the Sixt, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act III, scene ii]

He ſhall be made a chaſte and luſtleſſe Eunuch,And in my Sarell tend my Concubines:

c. 1587–1588, [Christopher Marlowe], Tamburlaine the Great. […] The First Part […], 2nd edition, part 1, London: […] [R. Robinson for] Richard Iones, […], published 1592; reprinted as Tamburlaine the Great (A Scolar Press Facsimile), Menston, Yorkshire, London: Scolar Press, 1973, Act III, scene iii

And the Levite, the husband of the woman that was slain, answered and said, I came into Gibeah that belongeth to Benjamin, I and my concubine, to lodge. And the men of Gibeah rose against me, and beset the house round about upon me by night, and thought to have slain me: and my concubine have they forced, that she is dead. And I took my concubine, and cut her in pieces, and sent her throughout all the country of the inheritance of Israel: for they have committed lewdness and folly in Israel.

1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], Judges 20:4–6

Solomon, who was one of the Deity's favorities, had a copulation cabinet composed of seven hundred wives and three hundred concubines.

c. 1909, Mark Twain, “Letter VIII”, in Letters from the Earth