noun
upper world; heaven; superkingdom
Refers to the realm above the human world in religious or mythological contexts; also used in biology for the taxonomic rank superkingdom (domain).
仏教では、上界は神々や悟りを開いた者が住む世界とされる。
In Buddhism, the upper world is considered the realm where gods and enlightened beings dwell.
生物の分類で、上界は界の上位に位置する。
In biological classification, superkingdom is a rank above kingdom.
noun
upper bound
Mathematical term for the least upper bound or a value that is greater than or equal to every element in a set.
この数列の上界は10である。
The upper bound of this sequence is 10.