liable or subject to change or alteration.
given to changing; constantly changing; fickle or inconstant: the mutable ways of fortune.

1350–1400; Middle English < Latin mūtābilis, equivalent to mūtā(re) to change + -bilis -ble

mutability, mutableness, noun
mutably, adverb
hypermutability, noun
hypermutable, adjective
hypermutableness, noun
hypermutably, adverb
nonmutability, noun
nonmutable, adjective
nonmutableness, noun
nonmutably, adverb
unmutable, adjective

1. changeable, variable. 2. unstable, vacillating, unsettled, wavering, unsteady.

2. stable.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mutable (ˈmjuːtəbəl)
1.  able to or tending to change
2.  astrology cardinal Compare fixed of or relating to four of the signs of the zodiac, Gemini, Virgo, Sagittarius, and Pisces, which are associated with the quality of adaptability
[C14: from Latin mūtābilis fickle, from mūtāre to change]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., "liable to change," from O.Prov. mutable, from L. mutabilis "changeable," from mutare "to change," from PIE base *mei- "to change, go, move" (cf. Skt. methati "changes, alternates, joins, meets;" Avestan mitho "perverted, false;" L. meare "to go, pass," migrare "to move from one place to another;"
O.C.S. mite "alternately;" Czech mijim "to go by, pass by," Pol. mijam "avoid;" Goth. maidjan "to change;" Hitt. mutai- "to be changed into"); with derivatives refering to the exchange of goods and services within a society as regulated by custom or law (cf. L. mutuus "done in exchange," munus "service performed for the community, duty, work"). Related: Mutability.
Online Etymology Dictionary, © 2010 Douglas Harper
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