D defs.my
Entry 2 senses Webster, 1913

Regulative

/(r?g"?*l?*t?v)/ · Reg·u·la·tive · IPA /rˈɛɡjəlˌeɪtɪv/
01 a. Tending to regulate; regulating.
  1. 1.
    Tending to regulate; regulating.
  2. 2.
    Necessarily assumed by the mind as fundamental to all other knowledge; furnishing fundamental principles; as, the regulative principles, or principles a priori; the regulative faculty.(Metaph.) Also: a priori