Word Study
equability
CIDE DICTIONARY
equability, 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. [1913 Webster]
"For the celestial bodies, the equability and constancy of their motions argue them ordained by wisdom."
[1913 Webster]
For further exploring for "equability" in Webster Dictionary Online
