axis

An imaginary or real straight line around which a body rotates or about which parts of a structure are symmetrically arranged.

• The Earth takes approximately twenty-four hours to complete a single rotation on its axis.

A reference line drawn on a graph used to measure and plot coordinates.

• Plot monthly revenue along the vertical axis and time along the horizontal axis.

A political or diplomatic alliance formed between two or more nations.

• The treaty formalized a strategic axis between the two neighboring powers to deter aggression.