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(n) :
an imaginary line around which an object spins (an axis of rotation) or is symmetrically arranged (an axis of symmetry); a fixed one-dimensional figure, such as a line or arc, with an origin and orientation and such that its points are in one-to-one correspondence with a set of numbers; an axis forms part of the basis of a space or is used to position and locate data in a graph (a coordinate axis)

"the Earth rotates once a day on its axis."

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for axis:

(n) :
an imaginary line around which an object spins (an axis of rotation) or is symmetrically arranged (an axis of symmetry); a fixed one-dimensional figure, such as a line or arc, with an origin and orientation and such that its points are in one-to-one correspondence with a set of numbers; an axis forms part of the basis of a space or is used to position and locate data in a graph (a coordinate axis)

"the Earth rotates once a day on its axis."