invariant

• POS: Adjective, Noun
• HYPHEN: in=var=i=ant

CIDE DICTIONARY

invariant, n. 

 An invariable quantity; specifically, a function of the coefficients of one or more forms, which remains unaltered, when these undergo suitable linear transformations.  J. J. Sylvester.  [1913 Webster]

OXFORD DICTIONARY

invariant, adj. & n.
--adj. invariable.
--n. Math. a function which remains unchanged when a specified transformation is applied.

Derivative

invariance n.