broadening

from WordNet (r) 3.0 (2006)

broadening
    n 1: the act of making something wider [syn: {widening},
         {broadening}] [ant: {narrowing}]
    2: the action of making broader; "the broadening of travel"
    3: an increase in width [syn: {widening}, {broadening}] [ant:
       {narrowing}]

from The Collaborative International Dictionary of English v.0.48

Broaden \Broad"en\, v. t. [imp. & p. p. {Broadened}; p. pr. &
   vb. n. {Broadening}.] [From {Broad}, a.]
   To grow broad; to become broader or wider.
   [1913 Webster]

         The broadening sun appears.              --Wordsworth.
   [1913 Webster]

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