Source : Webster's Revised Unabridged Dictionary (1913)

Kantian \Kant"i*an\, a.
   Of or pertaining to Immanuel Kant, the German philosopher;
   conformed or relating to any or all of the philosophical
   doctrines of Immanuel Kant.

Kantian \Kant"i*an\, n.
   A follower of Kant; a Kantist.

Source : WordNet®

Kantian
     adj : of or relating to Immanuel Kant or his philosophy