幾何(きか)

きか
noun
geometry
1. geometry
A branch of mathematics dealing with the properties and relationships of points, lines, surfaces, and shapes.
幾何(きか)の授業(じゅぎょう)で図形(ずけい)を学(まな)んだ。
I learned about shapes in geometry class.
幾何(きか)学(がく)は古代(こだい)ギリシャで発展(はってん)した。
Geometry developed in ancient Greece.
この建物(たてもの)は幾何(きか)学(がく)的(てき)なデザインだ。
This building has a geometric design.

幾何(きか) is the Japanese term for geometry, the branch of mathematics dealing with shapes, sizes, and spatial relationships.

ETYMOLOGY:

  • 幾(いく/き): how many, some
  • 何(なに/か): what

The term comes from classical Chinese and originally meant 'how much/many'.

COMMON COLLOCATIONS:

  • 幾何(きか)学(がく): geometry (as a field of study)
  • 幾何(きか)学(がく)的(てき): geometric, geometrical
  • 平面(へいめん)幾何(きか): plane geometry
  • 立体(りったい)幾何(きか): solid geometry
  • 解析(かいせき)幾何(きか): analytic geometry
  • ユークリッド幾何(きか)学(がく): Euclidean geometry

RELATED MATH TERMS:

  • 代数(だいすう): algebra
  • 解析(かいせき): analysis (calculus)
  • 図形(ずけい): shape, figure
  • 三角形(さんかくけい): triangle
  • 円(えん): circle

USAGE NOTE:
In everyday contexts, 幾何(きか)学(がく)的(てき) (geometric) is more commonly used than 幾何(きか) alone, as in 幾何(きか)学(がく)的(てき)な模様(もよう) (geometric pattern).

general
Added 2026.1.16 11:32 · Revised 2026.1.29 18:01
05000/05146_kika