Source : Webster's Revised Unabridged Dictionary (1913)

Don \Don\, v. t. [imp. & p. p. {Donned}; p. pr. & vb. n.
   {Donning}.] [Do + on; -- opposed to doff. See {Do}, v. t.,
   7.]
   To put on; to dress in; to invest one's self with.

         Should I don this robe and trouble you.  --Shak.

         At night, or in the rain, He dons a surcoat which he
         doffs at morn.                           --Emerson.

Don \Don\, n. [Sp. don; akin to Pg. dom, It. donno; fr. L.
   dominus master. See {Dame}, and cf. {Domine}, {Dominie},
   {Domino}, {Dan}, {Dom}.]
   1. Sir; Mr; Signior; -- a title in Spain, formerly given to
      noblemen and gentlemen only, but now common to all
      classes.

            Don is used in Italy, though not so much as in Spain
            France talks of Dom Calmet, England of Dom Calmet,
            England of Dan Lydgate.               --Oliphant.

   2. A grand personage, or one making pretension to
      consequence; especially, the head of a college, or one of
      the fellows at the English universities. [Univ. Cant]
      ``The great dons of wit.'' --Dryden.

Source : WordNet®

Don
     n 1: a Spanish title of respect for a gentleman or nobleman
     2: teacher at a university of college (especially at Cambridge
        or Oxford) [syn: {preceptor}]
     3: the head of an organized crime family [syn: {father}]
     4: Celtic goddess; mother of Gwydion and Arianrhod; corresponds
        to Irish Danu
     5: a European river in southwestern Russia; flows into the Sea
        of Azov [syn: {Don River}]