直 線(ちょくせん)

ちょくせん

noun

straight line

1. straight line

A line that extends in both directions without curving.

定規(じょうぎ)で直線(ちょくせん)を引(ひ)く。

Draw a straight line with a ruler.

二(ふた)つの点(てん)を結(むす)ぶ直線(ちょくせん)は一(ひと)つしかない。

There is only one straight line connecting two points.

この道(みち)は直線(ちょくせん)で10キロ続(つづ)く。

This road continues straight for 10 kilometers.

直線(ちょくせん) means a straight line, used in both mathematical and everyday contexts. The kanji combine 直(ちょく) (straight) + 線(せん) (line).

Common expressions

直線(ちょくせん)を引(ひ)く: to draw a straight line
直線(ちょくせん)距離(きょり): straight-line distance (as the crow flies)
直線(ちょくせん)コース: straight course/stretch
直線(ちょくせん)道路(どうろ): straight road

Similar words

直線(ちょくせん): straight line
曲線(きょくせん): curved line
線分(せんぶん): line segment (finite length)
半直線(はんちょくせん): ray (one endpoint)

Usage

Also used figuratively: ゴールまで直線(ちょくせん) (a straight shot to the goal / the home stretch).

Related Words

Antonym: 曲線(きょくせん) (curved line)

Compare: 線分(せんぶん) (line segment)

Related: 斜線(しゃせん) (diagonal line)

Compare: 折(お)れ線(せん) (broken line)

Compare: 交差線(こうさせん) (intersecting lines)

Compare: 垂線(すいせん) (perpendicular line)

Compare: 縦線(たてせん) (vertical line)

Compare: 線形(せんけい) (linear)

general

Added 2026.1.16 16:36 · Revised 2026.9.2 13:01

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