invariable

[ in-vair-ee-uh-buhl ]
/ ɪnˈvɛər i ə bəl /

adjective

not variable; not changing or capable of being changed; static or constant.

noun

something that is invariable; a constant.

Origin of invariable

late Middle English word dating back to 1400–50; see origin at in-3, variable
Related formsin·var·i·a·bil·i·ty, in·var·i·a·ble·ness, nounin·var·i·a·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for invariability

British Dictionary definitions for invariability

invariable

/ (ɪnˈvɛərɪəbəl) /

adjective

not subject to alteration; unchanging

noun

a mathematical quantity having an unchanging value; a constant
Derived Formsinvariability or invariableness, noun
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