D defs.my
Entry 1 sense Webster, 1913

Invariant

/ĭnˌ-vĕr'-ē-ənt/ · In·va·ri·ant · IPA /ˌɪnvˈɛriːənt/
01 n. An invariable quantity; specifically, a function of the coefficients of one or more forms, which remains unaltered, when these undergo suit…
  1. 1.
    An invariable quantity; specifically, a function of the coefficients of one or more forms, which remains unaltered, when these undergo suitable linear transformations.(Math.)