Invariable Definition

ĭn-vârē-ə-bəl
adjective
Not variable; not changing; constant; uniform.
Webster's New World

(by extension, grammar, of a word, or a grammatical class) That cannot undergo inflection, conjugation or declension.

The French adjective marron (brown) is invariable: it does not take the usual s in the plural.
Wiktionary
noun
An invariable quantity; constant.
Webster's New World
Synonyms:

Origin of Invariable

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