Source : Webster's Revised Unabridged Dictionary (1913)

Redoubt \Re*doubt"\, v. t. [F. redouter, formerly also spelt
   redoubter; fr. L. pref. re- re- + dubitare to doubt, in LL.,
   to fear. See {Doubt}.]
   To stand in dread of; to regard with fear; to dread. [R.]

Redoubt \Re*doubt"\ (r?*dout"), n. [F. redoute, fem., It.
   ridotto, LL. reductus, literally, a retreat, from L. reductus
   drawn back, retired, p. p. of reducere to lead or draw back;
   cf. F. r['e]duit, also fr. LL. reductus. See {Reduce}, and
   cf. {Reduct}, {R['e]duit}, {Ridotto}.] (Fort.)
   (a) A small, and usually a roughly constructed, fort or
       outwork of varying shape, commonly erected for a
       temporary purpose, and without flanking defenses, -- used
       esp. in fortifying tops of hills and passes, and
       positions in hostile territory.
   (b) In permanent works, an outwork placed within another
       outwork. See F and i in Illust. of {Ravelin}. [Written
       also {redout}.]

Source : WordNet®

redoubt
     n : a forbidding stronghold [syn: {sconce}]