1 a : a straight line about which a body or a geometric figure rotates or may be thought of as rotating
b : a straight line with respect to which a body, organ, or figure is symmetrical
2 a : the second vertebra of the neck of the higher vertebrates that is prolonged anteriorly within the foramen of the first vertebra and united with the dens which serves as a pivot for the atlas and head to turn upon — called also epistropheus
b : any of various central, fundamental, or axial parts – the cerebrospinal axis –the cerebrospinal axis
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