How to say "dimension" in Japanese

• 次元じげんCommon
  nounThe default for a dimension in mathematics or physics, such as the three dimensions of space; also used figuratively for a different level or plane of thinking or comparison.
• 区間くかんJLPT N1approx.Common
  noun, noun (suffix)Primarily means a section or segment, as of a railway track or route, and only marginally matches 'dimension'; it is seldom the word you want when you mean dimension in the usual sense.
  不通ふつう区間くかんの開通かいつうの見込みこみはまだない。↗

  There's no hope at this moment that the closed section will be reopened.
• 寸法すんぽうJLPT N2approx.Common
  nounCovers dimension as physical measurement or size, the length, width, and height of an object; the natural choice when taking or stating the dimensions of something.
  あなたの寸法すんぽうを計はかるのを許ゆるして下ください。↗

  Please allow me to measure you.
• 側面そくめんJLPT N1approx.Common
  nounA figurative dimension in the sense of one aspect or facet of a problem, situation, or issue; 'a new dimension of the problem' would naturally be expressed with this word.
  スポーツが人々ひとびとに訴うったえるのは、その健康的けんこうてき側面そくめんによるだけでなく、チーム競技きょうぎが養やしなう協調きょうちょう精神せいしん、それに競争きょうそう的てき側面そくめんそのものにもよるのである。↗

  It's not only the health aspects of sports that appeal to people, but the cooperative aspect that team sports teach, and the competitive aspect in itself.

Use 次元 for mathematical or figurative dimensions, 寸法 for physical size and measurements, 区間 mainly for a section or segment rather than a dimension, and 側面 for an aspect or side of an issue.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 次元じげんdimension
• 区間くかんsection (of track, etc.)
• 寸法すんぽうmeasurement
• ディメンションdimension
• 側面そくめんaspect