The plural of “axis” is “axes.” So, when referring to more than one axis, you would use the term “axes.” This applies in various contexts, such as mathematics, physics, and geometry, where the term is commonly used to describe lines or directions around which objects rotate or certain measurements are made.
For example:
- “The Cartesian coordinate system has three axes: x-axis, y-axis, and z-axis.”
- “The Earth rotates around its axis.”
- “To understand the movement of the object, consider both horizontal and vertical axes.”
In general, when discussing multiple instances of an axis, you would use “axes” to denote the plural form.