垂直

• Reading: すいちょく
• Romaji: suichoku
• Kanji breakdown: 垂 (sui) — to hang, droop; 直 (choku) — straight, direct
• Pronunciation: /sɯitɕokɯ/

Meaning

Vertical; perpendicular; forming a right angle with the horizontal plane.

A noun and na-adjective (垂直な) used in mathematics, science, and everyday description. In abstract or metaphorical usage, 垂直 can describe a steep power hierarchy or abrupt change (e.g., 垂直立ち上げ — a vertical launch). Contrasted with 水平 (horizontal) and 平行 (parallel).

Examples

1. 崖は垂直に切り立っており、登攀は困難を極めた。 The cliff rose vertically, making the climb extremely difficult.
2. 垂直方向の荷重に対する強度を確認してください。 Please verify the strength against vertical loads.
3. 二つの直線が垂直に交わる点を直角という。 The point where two lines intersect at a right angle is called a perpendicular intersection.

Usage Guide

Context: mathematics, science, engineering, geography

Tone: neutral

Origin & History

From 垂 (to hang down, to droop) and 直 (straight, direct). The image is of something hanging perfectly straight down — defining the vertical.

Cultural Context

Era: Modern

Generation: All ages

Social background: Universal