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

aquaculture that spans an entire lifespan in complete captivity

(computing theory) Turing complete

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)

Literally, "Neighbors nearby over family far away." People often rely more on unrelated people close to them rather than family who are living far away, in particular during times of disaster.

(Buddhism) think on the power of Kannon

(literally) know the other side and yourself, a hundred battles will not be perilous