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lability

[ luh-bil-i-tee, ley- ]
/ ləˈbɪl ɪ ti, leɪ- /
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noun
the fact or quality of being likely to change:The lability of the neuromuscular system during physical therapy was measured in muscle force and reaction times.
Chemistry, Biochemistry. the ability or likelihood of a substance or compound to change or break down easily, rapidly, or continually:It was found that the degree of lability varies considerably with different amido-aldehydes.
Psychiatry. the unregulated or unstable state of emotions or mood, characterized by exaggerated affective expression: They were concerned about his emotional lability, from flaring anger one moment to maudlin sentimentality the next.
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Origin of lability

First recorded in 1550–60 in a different sense; equivalent to Latin lābili(s) “sliding, slipping” (see labile) + -tās -ty2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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