evectantMath.|ɪˈvɛktənt| [f. L. ēvect-(see evector) + -ant.] A contravariant formed by operating upon an invariant or contravariant with an evector. 1876Salmon Higher Algebra 295 The discovery of evectants is Hermite's (Camb. & Dubl. Math. Jrnl. vi. 292).