(grammar) A tense that expresses action completed at some time in the future; in English it is formed by use of will have (or shall have) and a past participle

(grammar) A combination of the conditional mood and the perfect tense, roughly corresponding to English 'I would have...'

(number theory) A number that is the sum of all of its divisors except itself.

(music, uncountable) The ability to identify a note by name on hearing it, or to re-create a specified note from memory, without the benefit of an externally provided reference pitch.

(baseball) A game in which every batter on one team is retired without reaching base. / (bowling) A game in which the highest score possible is achieved, entailing a strike in every frame.

plural of perfect tense

A tense which describes actions that occurred before another action or event in the past; the pluperfect or the past anterior tense.

Exactly correct, correct in every letter.

In Latin, the three perfect tenses: perfect, future perfect, and pluperfect or past perfect, as contrasted with the present system: present, future, and imperfect. A verb in the perfect system indicates an action that has completed.

plural of perfect storm