In Noah Webster's original dictionary (1828) marriage is defined as follows:
"The act of uniting a man and woman for life; wedlock; the legal union of a man and woman for life. Marriage is a contract both civil and religious, by which the parties engage to live together in mutual affection and fidelity, till death shall separate them. Marriage was instituted by God Himself for the purpose of preventing the promiscuous intercourse of the sexes, for promoting domestic felicity, and for securing the maintenance and education of children."
Here is a link for further reading about Noah Webster, with some great quotes and other related definitions.
An Example of How Scholars of the Past Were Often Bible Believing Men
Here is how a modern dictionary are defining marriage:
Merriam-Webster's definition of marriage
Christian News Network
The article goes on to talk about celibacy. Have you heard of this word? It's not a word used very often in our society!
Outside biblical marriage, God's standard for sex is celibacy, saying "no" to both heterosexual and homosexual lusts ([Jesus said in Matthew 5:27-28: "Ye have heard that it was said by them of old time, Thou shalt not commit adultery:But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart."]). Celibacy is a gift of God that allows the unmarried to live a life of purity and contentment, so that a person does not have to engage in sex to have a full and satisfying life (1 Corinthians 7:7-9: "For I would that all men were even as I myself. But every man hath his proper gift of God, one after this manner, and another after that.I say therefore to the unmarried and widows, it is good for them if they abide even as I.But if they cannot contain, let them marry: for it is better to marry than to burn.").