The meaning of Marriage in the Bible
(From Easton's Bible Dictionary)

was instituted in Paradise when man was in innocence (Genesis 2:18-24). Here we have its original charter, which was confirmed by our Lord, as the basis on which all regulations are to be framed (Matthew 19:4,5). It is evident that monogamy was the original law of marriage (Matthew 19:5; I Corinthians 6:16). This law was violated in after times, when corrupt usages began to be introduced (Genesis 4:19; 6:2). We meet with the prevalence of polygamy and concubinage in the patriarchal age (Genesis 16:1-4; 22:21-24; 28:8,9; 29:23-30, etc.). Polygamy was acknowledged in the Mosaic law and made the basis of legislation, and continued to be practised all down through the period of Jewish histroy to the Captivity, after which there is no instance of it on record.

See more on the meaning of Marriage in the Bible:
Marriage {International Standard Bible Encyclopedia}

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