Invariable, a.
Etymology: [Pref. in- not + variable: cf. F. invariable.]
Not given to variation or change; unalterable; unchangeable; always uniform. Physical laws which are invariable. I. Taylor. -- In*va"ri*a*ble*ness, n. -- In*va"ri*a*bly, adv.
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Invariable, n. (Math.)
An invariable quantity; a constant.