Source : Webster's Revised Unabridged Dictionary (1913)

Brevet \Bre*vet"\ (br[-e]*v[e^]t"), v. t. [imp. & p. p.
   {Brevetted}; p. pr. & vb. n. {Brevetting}.] (Mil.)
   To confer rank upon by brevet.

Source : WordNet®

brevet
     n : a document entitling a commissioned officer to hold a higher
         rank temporarily (but without higher pay)
     v : promote somebody by brevet, in the military
     [also: {brevetting}, {brevetted}]

brevetting
     See {brevet}