eigenfunctions

/AY1 G AH0 N F AH0 NG K SH AH0 N Z/
noun
  1. 1

    A function \phi such that, for a given linear operator D, D\phi=\lambda\phi for some scalar \lambda (called an eigenvalue).

Source: https://en.wiktionary.org/wiki/eigenfunction, https://en.wiktionary.org/wiki/eigenfunctions