A sensation or feeling dizziness or whirling around including a loss of balance often as a result of looking down from a great height or by some disease affecting the inner ear: "Although he worked as a contractor on tall buildings, he had to be careful not to look down because there were times when he felt vertigo which could cause him to lose his balance."

The inclination of the head toward the stimulated side upon application of an electric current to the vestibular fibers of the eighth nerve.