A fixed reference line for the measurement of coordinates. In a two-dimensional coordinate system, a horizontal axis is often referred to as the x-axis and a vertical axis is referred to as the y-axis.

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- Axis (plural - axes)

A fixed reference line for the measurement of coordinates. In a two-dimensional coordinate system, a horizontal axis is often referred to as the x-axis and a vertical axis is referred to as the y-axis.

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