Webster's English Dictionary

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diagram

1. di.a.gram also di.a.gram.mat.i.cal \'di--*-.gram\ \.di--*-gr*-'mat-ik\ 
   \-'mat-i-k*l\ \-i-k(*-)le-\ n [Gk diagramma, fr. diagraphein to mark out by 
   lines, fr. dia-] + graphein to write - more at CARVE 1: a line drawing made 
   for mathematical or scientific purposes  2: a graphic design that explains 
   rather than represents  - di.a.gram.mat.i.c aj
2. diagram \-.gramd\ \-.gram-in\ vt or di.a.gramed or di.a.grammed;  or 
   di.a.gram.ing;  or di.a.gram.ming : to represent by or put into the form of 
   a diagram