An aircraft in flight is free to rotate in three dimensions: yaw, nose left or right about an axis running up and down; pitch, nose up or down about an axis running from wing to wing; and roll, rotation about an axis running from nose to tail. The yaw, pitch, and roll axes are alternatively designated as vertical, lateral (or transverse), and longitudinal respectively.
An aircraft in flight is free to rotate in three dimensions: yaw, nose left or right about an axis running up and down; pitch, nose up or down about an axis running from wing to wing; and roll, rotation about an axis running from nose to tail. The yaw, pitch, and roll axes are alternatively designated as vertical, lateral (or transverse), and longitudinal respectively.
Source: Wikipedia "Aircraft principal axes" · CC BY-SA 4.0
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