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Definition of Incontestability
1. n. The quality or state of being incontestable.
Definition of Incontestability
1. Noun. The characteristic of being incontestable. ¹
2. Noun. (legal) In United States trademark law, the state of having been registered as a trademark for more than five consecutive years without a challenge, and therefore conclusively presumed not to cause confusion with any other trademark, and to have acquired distinctiveness. ¹
¹ Source: wiktionary.com