平面(へいめん)

へいめん
noun
flat surface; plane
1. flat surface; plane; two-dimensional surface
A surface that is flat and level, without curves or elevations. Used both in everyday language for flat surfaces and in mathematics and geometry for a two-dimensional plane.
平面(へいめん)に線(せん)を引(ひ)く。
To draw a line on a flat surface.
平面(へいめん)図(ず)で間取(まど)りを確認(かくにん)する。
To check the floor layout on a plan view.
数学(すうがく)では、二(ふた)つの平面(へいめん)が交(まじ)わると直線(ちょくせん)ができる。
In mathematics, when two planes intersect, a straight line is formed.

A flat, two-dimensional surface. Composed of 平(へい) (flat/level) + 面(めん) (surface/face). Used in everyday language, architecture, and mathematics.

COMMON COLLOCATIONS:

  • 平面(へいめん)図(ず): floor plan; plan view
  • 平面(へいめん)幾何学(きかがく): plane geometry
  • 平面(へいめん)的(てき): flat; two-dimensional (also figuratively: lacking depth)
  • 平面(へいめん)交差(こうさ): at-grade intersection (roads crossing on the same level)
  • 平面(へいめん)駐車場(ちゅうしゃじょう): surface-level parking lot

SIMILAR WORDS:

  • 立体(りったい): three-dimensional object — the conceptual opposite of 平面(へいめん)
  • 表面(ひょうめん): surface — refers to the outer face of an object, not necessarily flat
  • 水平(すいへい): horizontal; level — describes orientation rather than dimensionality

USAGE:
When used as a modifier (平面(へいめん)的(てき)), it can describe something figuratively as lacking depth or dimensionality, such as a flat, uninteresting character in a novel.

general
Added 2026.3.28 21:53
20000/20096_heimen