Etymology
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variability (n.)

1771, from variable (Latin variabilis) + -ity.

updated on March 08, 2014

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Definitions of variability from WordNet

variability (n.)
the quality of being subject to variation;
Synonyms: variableness / variance
variability (n.)
the quality of being uneven and lacking uniformity;
Synonyms: unevenness
From wordnet.princeton.edu, not affiliated with etymonline.