[ley-buhl, -bahyl]
apt or likely to change.
Chemistry. (of a compound) capable of changing state or becoming inactive when subjected to heat or radiation.

1400–50; late Middle English labyl < Late Latin lābilis, equivalent to Latin lāb(ī) to slip + -ilis -ile

lability [luh-bil-i-tee, ley-] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
labile (ˈleɪbɪl)
1.  chem (of a compound) prone to chemical change
2.  liable to change or move
[C15: via Late Latin lābilis, from Latin lābī to slide, slip]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

labile la·bile (lā'bīl', -bəl)
Constantly undergoing or likely to undergo change; unstable.

la·bil'i·ty (-bĭl'ĭ-tē) n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The study also corroborates a growing literature on the lability of the human brain.
Lots of the usual reasons for mental status changes, even emotional lability.
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