Defective verb

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In linguistics, a defective verb is a verb that either lacks a conjugated form or entails incomplete conjugation, and thus cannot be conjugated for certain grammatical tenses, aspects, persons, genders, or moods that the majority of verbs or a "normal" or regular verb in a particular language can be conjugated for^{[citation needed]}. That is to say, a defective verb lacks forms that most verbs in a particular language have.