DICT.TW Dictionary Taiwan

 con·cu·bine /ˈkɑŋkjʊˌbaɪn, ˈkɑn-/
 妾,姘婦,第二夫人以下之妻

 Con·cu·bine n.
 1. A woman who cohabits with a man without being his wife; a paramour.
 Note: ☞ Concubine has been sometimes, but rarely, used of a male paramour as well as of a female.
 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.
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 concubine
      n : a woman who cohabits with an important man [syn: courtesan,
           doxy, odalisque, paramour]

 Concubine
    in the Bible denotes a female conjugally united to a man, but in
    a relation inferior to that of a wife. Among the early Jews,
    from various causes, the difference between a wife and a
    concubine was less marked than it would be amongst us. The
    concubine was a wife of secondary rank. There are various laws
    recorded providing for their protection (Ex. 21:7; Deut.
    21:10-14), and setting limits to the relation they sustained to
    the household to which they belonged (Gen. 21:14; 25:6). They
    had no authority in the family, nor could they share in the
    household government.
      The immediate cause of concubinage might be gathered from the
    conjugal histories of Abraham and Jacob (Gen. 16;30). But in
    process of time the custom of concubinage degenerated, and laws
    were made to restrain and regulate it (Ex. 21:7-9).
      Christianity has restored the sacred institution of marriage
    to its original character, and concubinage is ranked with the
    sins of fornication and adultery (Matt. 19:5-9; 1 Cor. 7:2).