The Collaborative International Dictionary
Voidable \Void"a*ble\, a.
Capable of being voided, or evacuated.
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(Law) Capable of being avoided, or of being adjudged void, invalid, and of no force; capable of being either avoided or confirmed.
If the metropolitan . . . grants letters of administration, such administration is not, but voidable by sentence.
--Ayliffe.Note: A voidable contract may be ratified and confirmed; to render it null and of no effect, it must be avoided; a void contract can not be ratified.
Douglas Harper's Etymology Dictionary
late 15c., from void (v.) + -able.
Wiktionary
a. 1 that may be voided, rescinded or annulled 2 that may be avoided; avoidable
WordNet
adj. capable of being rescinded or voided; "the judgment was rescindable"; "voidable contracts" [syn: rescindable]
Wikipedia
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.
Usage examples of "voidable".
John White, the old chief deputy, called him Una voidable Delay Guardia.
If Gregory Moxley is really Gregory Lorton, your first husband, and he showed up alive and well, your marriage to Carl Montaine is voidable.