Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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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 see 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]