perfect and without blemish; flawless

(number theory) perfect number, a positive integer that is equal to the sum of its positive divisors, excluding the number itself

(mathematics) panmagic square

aquaculture that spans an entire lifespan in complete captivity

alcoholism (chronic disease) (abbr. アル中)

(computing) character whose appearance may depend on a user's environment, or a character which may be absent from a user's environment, i.e. character set incompatibility

(computing) character whose appearance may depend on a user's environment, or a character which may be absent from a user's environment, i.e. character set incompatibility

Synonym of 黄昏 (tasogare, “dusk; twilight”) / Synonym of 黄昏時 (tasogaredoki, “dusk; twilight”)

perfectionist

(music) perfect fifth (interval between the first and second overtones or of seven semitones)