<p><strong>Adjective</strong></p><ul><li>Relating to or characterized by defects or weaknesses: With my imperfect vision I couldn’t make out the street name.</li><li>Not perfect; lacking completeness: Human knowledge on all subjects is imperfect.</li><li>Grammar. Designating a verb aspect, tense, or other verb category used to express an action or state still in process at some point of reference in time, especially in the past.</li><li>Law. Being without legal effect or support; unenforceable.</li><li>Botany. (Of a flower) diclinous.</li><li>Music. Of or relating to the interval of a major or minor third or sixth.</li></ul><p><strong>Noun</strong></p><ul><li>Grammar. In some languages, a verb aspect, tense, or other verb category used to express an action or state still in process at some point of reference in time, especially in the past.</li><li>An instance or form of a specific verb in such an aspect, tense, or construction, such as Latin portābam “I was carrying.”</li></ul>