Webster's English Dictionary

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neutralize

neu.tral.ize \'n(y)u:-tr*-.li-z\ vt 1: to make chemically neutral  2: to 
   destroy the effectiveness of : NULLIFY  3: to make electrically inert by 
   combining equal positive and negative qua ntities 4: to invest with 
   conventional or obligatory neutrality conferring inviola bility under 
   international law by belligerents 5: to make neutral by blending with the 
   complementary color  : to undergo neutralization  - neu.tral.iz.er n