From The Collaborative International Dictionary of English v.0.48 [gcide]:
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.
From WordNet (r) 3.0 (2006) [wn]:
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