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Wiktionary
material breach

n. 1 (context legal English) a breach of contract sufficiently serious to destroy the contract 2 a breach of a treaty which releases other parties from any obligation under it

WordNet
material breach

n. a breach serious enough to destroy the value of the contract and to give a basis for an action for breach of contract

Usage examples of "material breach".

Any such communication by CONTRACTOR shall be deemed to be a material breach of CONTRACT by CONTRACTOR.