Definition: obviation

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Source: WordNet (r) 1.7 

obviation
     n : the act of preventing something by anticipating and
         disposing of it effectively [syn: forestalling, preclusion]

Source: Webster's Revised Unabridged Dictionary (1913) 

Obviation \Ob`vi*a"tion\, n.
   The act of obviating, or the state of being obviated.