Comprehensive
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future perfect a verb tense that indicates that an action or state will be completed at some time before a moment in the future, as in "By then he will have realized his error". [2 definitions]
letter-perfect correct or accurate in every detail.
past perfect a verb tense that indicates that an action or state was completed at some indefinite time before a moment in the past, as in "They had already gone". [2 definitions]
perfect number a positive integer that is equal to the sum of its divisors, including one but excluding itself.
perfect pitch the ability to sing or recognize the pitch of any musical tone heard; absolute pitch.
present perfect a verb tense that indicates that an action or state has been completed at some indefinite time up to the present, as in "I have lived in four countries". [2 definitions]