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

plural of perfect storm

(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.

In Mahayana Buddhism, the six virtues which the bodhisattva must practice in their avowed pursuit of bringing all beings to enlightenment through bodhicitta; they are dana (munificence), sila (ethicality), ksanti (patience), virya (determination), dhyana (meditation), and prajna (wisdom).

Perfect in appearance as with the subjects in paintings or photographs, without the common imperfections of real life.

(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 perfect tense that expresses action in the past (usually completed) with consequences in the present time.

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

(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.

(grammar) A feature of the verb which denotes viewing the event the verb describes as a completed whole, rather than from within the event as it unfolds. For example, "she sat down" as opposed to "she was sitting down". Since the focus is on the completion of what is expressed by the verb, this aspect is generally associated with the past and future tenses. This term is often used interchangeably with aorist aspect. This is not to be confused with the perfect tense.