Source : Webster's Revised Unabridged Dictionary (1913)

Epanorthosis \Ep`an*or*tho"sis\, n. [L., fr. Gr. ?; 'epi` + ? to
   set right again; ? again + ? to set straight.]
   A figure by which a speaker recalls a word or words, in order
   to substitute something else stronger or more significant;
   as, Most brave! Brave, did I say? most heroic act!

Source : WordNet®

epanorthosis
     n : immediate rephrasing for intensification or justification;
         "Seems, madam! Nay, it is"