Lability refers to something that's constantly undergoing change or something that's likely to undergo change. Chemistry The term is used to describe a relatively unstable and transient chemical species. As a general example, if molecule exists in a particular conformation for a short life-time, before adopting a lower energy conformation, the former molecular structure is said to have 'high lability' (such as C25, a 25-carbon fullerene spheroid). The term is sometimes also used in reference to… (More on Lability)