資料來源 : pyDict

自原因推及結果的,以演繹法的自原因推及結果地,以演繹法地

資料來源 : Webster's Revised Unabridged Dictionary (1913)

A priori \A` pri*o"ri\ [L. a (ab) + prior former.]
   1. (Logic) Characterizing that kind of reasoning which
      deduces consequences from definitions formed, or
      principles assumed, or which infers effects from causes
      previously known; deductive or deductively. The reverse of
      a posteriori.

   3. (Philos.) Applied to knowledge and conceptions assumed, or
      presupposed, as prior to experience, in order to make
      experience rational or possible.

            A priori, that is, form these necessities of the
            mind or forms of thinking, which, though first
            revealed to us by experience, must yet have
            pre["e]xisted in order to make experience possible.
                                                  --Coleridge.

資料來源 : WordNet®

a priori
     adj 1: involving deductive reasoning from a general principle to a
            necessary effect; not supported by fact; "an a priori
            judgment" [ant: {a posteriori}]
     2: based on hypothesis or theory rather than experiment
     adv : derived by logic, without observed facts [ant: {a posteriori}]