invariable

Academic Word List, sublist 1.

About 1.06 uses per million words.

Meaning

1. adjective Not variable; unalterable; uniform; always having the same value.
2. adjective Constant.
3. adjective That cannot undergo inflection, conjugation or declension.

   The French adjective marron ‘brown’ is invariable: it does not take the usual s in the plural.

4. noun Something that does not vary; a constant.

Similar words

invariant constant unvarying changeless steady hard-and-fast strict unabated fixed unchanging

Often followed by

rule and in custom practice concomitance laws result accompaniment

Word family

invariabilities invariability invariables invariably involve involved involvement involves involving