\E`qua*bil"i*ty\, n. [L. aequabilitas, fr.
aequabilis. See {Equable}.]
The quality or condition of being equable; evenness or
uniformity; as, equability of temperature; the equability of
the mind.
      For the celestial bodies, the equability and constancy
      of their motions argue them ordained by wisdom. --Ray.