Source : Webster's Revised Unabridged Dictionary (1913)

Infantry \In"fan*try\, n. [F. infanterie, It. infanteria, fr.
   infante infant, child, boy servant, foot soldier, fr. L.
   infans, -antis, child; foot soldiers being formerly the
   servants and followers of knights. See {Infant}.]
   1. A body of children. [Obs.] --B. Jonson.

   2. (Mil.) A body of soldiers serving on foot; foot soldiers,
      in distinction from cavalry.

Source : WordNet®

infantry
     n : an army unit consisting of soldiers who fight on foot;
         "there came ten thousand horsemen and as many fully-armed
         foot" [syn: {foot}]