mutable (adj.)

late 14c., "liable to change," from Latin mutabilis "changeable," from mutare "to change," from PIE root *mei- (1) "to change, go, move," with derivatives referring to the exchange of goods and services as regulated by custom or law (compare Latin mutuus "done in exchange").

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Definitions of mutable from WordNet

mutable (adj.)
prone to frequent change; inconstant;
the mutable ways of fortune
the fickle and mutable nature of truth
mutable (adj.)
capable of or tending to change in form or quality or nature;
a mutable substance
mutable weather patterns
a mutable foreign policy
Synonyms: changeable
mutable (adj.)
tending to undergo genetic mutuation;
It is likely, too, that the chromosomes of all eubacteria are as mutable as that of E. coli