Synonyms: variability, variableness, variance
Definition: the quality of being subject to variation
Similar words: changeability, changeableness
Definition: the quality of being changeable; having a marked tendency to change
Usage: the changeableness of the weather
Synonyms: unevenness, variability
Definition: the quality of being uneven and lacking uniformity
Similar words: unregularity, irregularity
Definition: not characterized by a fixed principle or rate; at irregular intervals