/ ɪnˈveəriəbl; NAmE -ˈver-/ adjective
always the same; never changing
SYN unchanging :
Her routine was invariable.
his invariable courtesy and charm
an invariable principle
—compare variable
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WORD ORIGIN
late Middle English : from French , or from late Latin invariabilis , from in- not + variabilis ( from variare , from varius diverse).