Translation guide
The English word 'axis' can refer to a physical line around which something rotates, a conceptual line in graphs or diagrams, or a figurative alignment or alliance. This guide covers the most common and natural Japanese equivalents for each meaning.
A real or imaginary line around which an object rotates or is symmetrically arranged.
The most common and general term for a physical axis, such as the axis of the Earth, a wheel, or a mechanical part.
地球は地軸を中心に回転している。
The Earth rotates on its axis.
この車輪の軸が曲がっている。
The axis of this wheel is bent.
Specifically refers to an axis of rotation, often used in technical or mechanical contexts.
モーターの回転軸が摩耗している。
The motor's rotation axis is worn out.
Central axis, often used for symmetry or the main axis of an object.
建物の中心軸に沿って柱が並んでいる。
Pillars are lined up along the central axis of the building.
A reference line in a coordinate system, such as the x-axis or y-axis.
Used for axes in graphs and coordinate systems. Combine with x, y, z or 横 (horizontal), 縦 (vertical).
グラフの横軸は時間を表している。
The horizontal axis of the graph represents time.
X軸とY軸の交点を原点という。
The intersection of the X-axis and Y-axis is called the origin.
Coordinate axis, a more formal or mathematical term.
A figurative line around which things are organized, such as a political alliance or a central idea.
Used figuratively for a central principle, policy, or axis of cooperation. Often appears in compounds like 外交軸 (diplomatic axis) or 政策の軸 (policy axis).
両国の協力関係が新たな外交軸となった。
The cooperative relationship between the two countries became a new diplomatic axis.
この計画の軸となる考え方は持続可能性だ。
The central idea (axis) of this plan is sustainability.
Often used for a political or military axis, such as the Axis powers in WWII. Can sound historical or formal.
Basic axis, fundamental principle, or mainstay. Often used in economics or policy.
A specific anatomical line or structure, such as the axis vertebra.
The second cervical vertebra (C2), also called the axis. Medical term.
軸椎は環椎とともに頭の回転を可能にする。
The axis, together with the atlas, enables rotation of the head.
While 軸 (jiku) can be used figuratively, overusing it may sound unnatural. In many cases, rephrasing with 中心 (center), 基本 (basis), or 方針 (policy) is more natural. For example, 'the axis of the argument' is better expressed as 議論の中心 (the center of the argument) rather than 議論の軸.
軸 is very productive in compounds. Common examples: 時間軸 (time axis), 対称軸 (axis of symmetry), 主軸 (main axis or principal axis). When coining new terms, 軸 is often understood if the context is clear.
3次元空間では3つの座標軸が必要だ。
In three-dimensional space, three coordinate axes are needed.
枢軸国は第二次世界大戦で連合国と戦った。
The Axis powers fought against the Allies in World War II.
The fundamental axis of this theory is the balance of supply and demand.