(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

A (form of) rhyme in which the vowels and final (coda) consonants of stressed syllables (and, in modern English poetry, any following syllables to the end of the words) are identical in sound. (Contrast with half rhyme.)