n. [ Cf. F. invariabilité. ] The quality of being invariable; invariableness; constancy; uniformity. [ 1913 Webster ]
a. [ Pref. in- not + variable: cf. F. invariable. ] Not given to variation or change; unalterable; unchangeable; always uniform. [ 1913 Webster ]
Physical laws which are invariable. I. Taylor.
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n. (Math.) An invariable quantity; a constant. [ 1913 Webster ]
adv. Always; in every case. [ PJC ]