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Voidable, in law, is a transaction or action that is valid but may be annulled by one of the parties to the transaction. Voidable is usually used in distinction to void ab initio (or void from the outset) and unenforceable. (Wikipedia)

A voidable contract is an agreement that would be binding and enforceable except the circumstances surrounding its execution, or the fact that one of the parties lacks capacity, makes the contract voidable at the option of one of the parties. For example, a person who has been forced to sign an agreement against his will may avoid being bound by the agreement. (USLegal)

"contractual relationship. Legal relationship between contracting-parties evidenced by (1) an offer, (2) acceptance of the offer, and a (3) valid (legal and valuable) consideration. Existence of a contractual relationship, however, does not necessarily mean the contract is enforceable, that it is not void (see void contract), or not voidable (see voidable contract). ()

Mistake of fact: Where both the parties enter into an agreement are under a mistake as to a matter of fact essential to the agreement, the agreement is voidable. (LegalMatch)