adjective. Not changing or subject to change; constant.

Not variable; constant; uniform; unchanging.

Not capable of being varied; unalterable; unchangeable.

noun. In mathematics, a quantity that does not vary; a constant.

adjective. Not given to variation or change; unalterable; unchangeable; always uniform.

noun. An invariable quantity; a constant.

adjective. Not variable; that always has the same value in different occurrences.

adjective. constant.

adjective. That cannot undergo inflection, conjugation or declension.

noun. Something that does not vary; a constant.

adjective. not liable to or capable of change

noun. a quantity that does not vary

"It is this that constitutes the invariable laws of motion: I say _invariable_, because they can never change, without producing confusion in the essence of things."

invariable antecedent  invariable pendulum  invariable system  invariant  

changeless  constant  hard-and-fast  invariant  strict  

variable  

constant  constitutional  definite  habitual  indispensable  

abiding  accordant  alike  automatic  balanced