Source : Webster's Revised Unabridged Dictionary (1913)

Stupefaction \Stu`pe*fac"tion\, n. [Cf. F. stup['e]faction. See
   {Stupefacient}.]
   The act of stupefying, or the state of being stupefied.
   [Written also {stupifaction}.]

         Resistance of the dictates of conscience brings a
         hardness and stupefaction upon it.       --South.

Source : WordNet®

stupefaction
     n 1: a feeling of stupefied astonishment
     2: marginal consciousness; "his grogginess was caused as much
        by exhaustion and by the blows"; "someone stole his wallet
        while he was in a drunken stupor" [syn: {grogginess}, {stupor},
         {semiconsciousness}]
     3: the action of stupefying; making dull or lethargic; "the
        professor was noted for his stupefaction of the students"