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.
The Earth rotates on its axis.
The axis of this wheel is bent.
Specifically refers to an axis of rotation, often used in technical or mechanical contexts.
The motor's rotation axis is worn out.
Central axis, often used for symmetry or the main axis of an object.
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.
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).
The cooperative relationship between the two countries became a new diplomatic axis.
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.
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.
The intersection of the X-axis and Y-axis is called the origin.
In three-dimensional space, three coordinate axes are needed.
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.
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.
この理論の基軸は需要と供給のバランスだ。
The fundamental axis of this theory is the balance of supply and demand.