Contestable (adjective)

Open to challenge; capable of being disputed.

Origin:

Late middle english (in the sense 'fit for being contested'): from old french, or from latin contestabilis, from contestari 'to call to witness, dispute', from con- 'together with' + testari 'to witness'. the sense 'capable of being contested' dates from the mid 19th century.

Examples:

1. The results of the election were contestable.
2. His views on the subject are contestable.
3. The contestable market is the part of the electricity market that is open to competition.
4. Her claim to the throne was contestable.
5. The contestable period is the period during which a policyholder can contest the policy.