[ih-myoo-tuh-buh l]


not mutable; unchangeable; changeless.

Origin of immutable

First recorded in 1375–1425; late Middle English word from Latin word immūtābilis. See im-2, mutable
Related formsim·mu·ta·bil·i·ty, im·mu·ta·ble·ness, nounim·mu·ta·bly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for immutability



unchanging through time; unalterable; agelessimmutable laws
Derived Formsimmutability or immutableness, nounimmutably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for immutability

1590s, from Latin immutabilitas, from immutabilis (see immutable).

Nought may endure but Mutability. [Shelley]



early 15c., from Old French immutable and directly from Latin immutabilis "unchangeable," from assimilated form of in- "not, opposite of" (see in- (1)) + mutabilis "changeable," from mutare "to change" (see mutable). Related: Immutably.

Online Etymology Dictionary, © 2010 Douglas Harper