plural of perfect tense

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.

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.)

(meteorology, informal) A powerful hurricane or other major weather disturbance, especially as produced by a combination of meteorological conditions.

plural of perfect storm

(music) an interval equal to that of between the second and third harmonics of the harmonic series; in equal temperament, an interval of seven semitones spanning five degrees of the diatonic scale. It is enharmonically equivalent to a diminished sixth.

(video games, design) Involving precision at the pixel level. / (computing, design) Having precise dimension ratios in all aspects on well-defined drawing glyphs.

(mathematical analysis) A set which is equal to its set of limit points. That is, a set A is perfect if A'=A.

plural of perfect number

plural of perfect game