The quality of being deviable; the capacity or likelihood of something to deviate from a standard path or pattern.
From deviable (able to deviate) + -ity suffix. Deviable comes from deviate, which derives from Latin deviare (to turn aside).
Deviability is a rare word in modern statistics and science, but it captures something important: the measurable tendency of something to wander off course. Engineers use this concept when designing systems that need predictable behavior—they measure deviability in test data.
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