The Collaborative International Dictionary of English v.0.48:

Beautify \Beau"ti*fy\ (b[=u]"t[i^]*f[imac]), v. t. [imp. & p. p.
   Beautified (b[=u]"t[i^]*f[imac]); p. pr. & vb. n.
   Beautifying.] [Beauty + -fy.]
   To make or render beautiful; to add beauty to; to adorn; to
   deck; to grace; to embellish.
   [1913 Webster]

         The arts that beautify and polish life.  --Burke.
   [1913 Webster]

   Syn: To adorn; grace; ornament; deck; decorate.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Beautify \Beau"ti*fy\, v. i.
   To become beautiful; to advance in beauty. --Addison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

beautify
    v 1: make more beautiful [syn: fancify, beautify,
         embellish, prettify] [ant: uglify]
    2: be beautiful to look at; "Flowers adorned the tables
       everywhere" [syn: deck, adorn, decorate, grace,
       embellish, beautify]
    3: make more attractive by adding ornament, colour, etc.;
       "Decorate the room for the party"; "beautify yourself for the
       special day" [syn: decorate, adorn, grace, ornament,
       embellish, beautify]