in the form of a diagram; graphic; outlined.
pertaining to diagrams.

Also di·a·gram·mat·i·cal.

Origin of diagrammatic

1850–55; diagram + -atic as in problem, problematic
Related formsdi·a·gram·mat·i·cal·ly, adverbnon·di·a·gram·mat·ic, adjectivenon·di·a·gram·mat·i·cal, adjectivenon·di·a·gram·mat·i·cal·ly, adverbun·di·a·gram·mat·ic, adjectiveun·di·a·gram·mat·i·cal, adjectiveun·di·a·gram·mat·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for diagrammatic

Historical Examples of diagrammatic