also: しじげん
noun, noun which may take the genitive case particle 'no'
fourth dimension; four dimensions; 4D
Refers to the concept of a fourth spatial dimension in mathematics, physics, or science fiction. Often used attributively with の to describe something as four-dimensional.
It's difficult to imagine a four-dimensional world.
This movie is themed around four-dimensional space.
次元 means 'dimension' in general. 四次元 specifies the number of dimensions as four.
Standard kanji spelling; the most common written form.
Alternate reading しじげん; less common than よじげん.
Numerical variant using Arabic numeral 4; seen in technical or informal contexts.
Numerical variant with the rare reading しじげん.
Compound of 四 (four) and 次元 (dimension). The reading よじげん uses the native Japanese reading for 四, while しじげん uses the Sino-Japanese reading; よじげん is more common in modern usage.