isocratic

/AY0 S AH0 K R AE1 T IH0 K/
adjective
  1. 1

    Of or relating to isocracy.

  2. 2

    (of an HPLC system) which resolves a solute using a solvent system that does not change composition during the run.

Source: https://en.wiktionary.org/wiki/isocratic