Merriam-Webster Online Dictionary

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One entry found for invariable.
Main Entry: in·vari·able
Pronunciation: (")in-'ver-E-&-b&l
Function: adjective
Date: 15th century
: not changing or capable of change : CONSTANT <an invariable routine>
- in·vari·abil·i·ty /-"ver-E-&-'bi-l&-tE/ noun
- invariable noun