[di.a.gram] n [Gk diagramma, fr. diagraphein to mark out by lines, fr. dia- + graphein to write--more at carve] (1619) 1: a graphic design that explains rather than represents; esp: a drawing that shows arrangement and relations (as of parts)
2: a line drawing made for mathematical or scientific purposes -- di.a.gram.ma.ble adj -- di.a.gram.mat.ic also di.a.gram.mat.i.cal adj -- di.a.gram.mat.i.cal.ly adv
[2]diagram vt -grammed or -gramed ; -gram.ming or -gram.ing (1840): to represent by or put into the form of a diagram