astahImage: astahDefine block diagram. block diagram synonyms, (Geological Science) a three-dimensional drawingrepresenting a block of the earth's crust, showing geological structure. 3. (Computer Science) computing a diagram showing the interconnections between electronic components or parts of a program. Block diagram - definition of block diagram by The Free Was this helpful? Functional Block Diagram | Process Flowchart | Technical Block diagrams solution extends ConceptDraw PRO software with templates, samples and libraries of vector stencils for drawing the block diagrams. Engineering This solution extends ConceptDraw PRO v9.4 with the ability to visualize industrial systems in electronics, electrical, chemical, process, and mechanical engineering.