
A voidable marriage (also called an avoidable marriage) is a marriage which can be canceled at the option of one of the parties. The marriage is valid but is subject to cancellation if contested in court by one of the parties to the marriage. The validity of a voidable marriage can only be made by one of the parties to the marriage; thus, a voidab...
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http://en.wikipedia.org/wiki/Voidable_marriage

A valid marriage that can be annulled if challenged, but that otherwise remains legitimate. For instance, if one of the parties was a minor at the time of marriage, the marriage could be annulled if challenged. If it's never challenged, the marriage is considered valid.
Found on
http://www.lectlaw.com/def2/u042.htm
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