- Dieuaide d. SYN: triaxial reference system.
- flow d. a d. composed of blocks connected by arrows representing steps in a process such as decision analysis.
- Venn d. pictorial representation of the extent to which two or more quantities or concepts are mutually inclusive and exclusive.
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di·a·gram (diґə-gram) a graphic representation, in simplest form, of an object or concept, made up of lines and lacking entirely any pictorial elements. diagrammatic adjMedical dictionary. 2011.