Synonyms: invariability, invariableness, invariance
Definition: the quality of being resistant to variation
Similar words: unchangeability, unchangeableness, unchangingness, changelessness
Definition: the quality of being unchangeable; having a marked tendency to remain unchanged
Synonyms: evenness, invariability
Definition: a quality of uniformity and lack of variation
Similar words: regularity
Definition: the quality of being characterized by a fixed principle or rate
Usage: he was famous for the regularity of his habits