Origin: Latin suffix -able
Invariable has 4 different meanings across 2 categories:
a quantity that does not vary
Something that does not vary; a constant.
not liable to or capable of change
"an invariable temperature"
"an invariable rule"
"his invariable courtesy"
Not variable; unalterable; uniform; always having the same value.
This word comes from combining the prefix in- with variable. It originally meant "not changing."