Invariable

Pronunciation

Origin

- + variable

Full definition of invariable

Adjective

1. Not variable; unalterable; uniform; always having the same value.
• I. TaylorPhysical laws which are invariable.
2. (math) constant.
3. (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.

Noun

1. Something that does not vary; a constant.