Webster's English Dictionary

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argument

ar.gu.ment \'a:r-gy*-m*nt\ n [ME, fr. MF, fr. L argumentum, fr. arguere] 
   obs  1: an outward sign : INDICATION  2: a reason given in proof or 
   rebuttal  3a: the act or process of arguing : ARGUMENTATION  3b: a coherent 
   series of reasons offered  3c: DISAGREEMENT, QUARREL  4: an abstract or 
   summary esp. of a literary work  5: the subject matter esp. of a literary 
   work  6: one of the independent variables upon whose value that of a 
   function dep ends