Voidable

Having no legal effect or consequence if the party affected so chooses.

That which has some force or effect, but which, in consequence of some inherent quality, may be legally annulled or avoided.

As a familiar example, may be mentioned the case of a contract, made by an infant with an adult, which maybe avoided or confirmed by the former on his coining of age.

Such contracts are generally of binding force until avoided by the party having a right to annul them.
   

This entry contains material from Bouvier's Legal Dictionary, a work published in the 1850's.

The law distinguishes between contracts which are void and those which are voidable. - (read more on Voidable)