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1. : a graphic design that explains rather than represents. especially : a drawing that shows arrangement and relations (as of parts) 2. : a line drawing made for mathematical or scientific purposes. diagrammable.
Flowchart Maker and Online Diagram Software draw.io is free online diagram software. You can use it as a flowchart maker, network diagram software, to create UML online, as an ER diagram tool, to design database schema, to build BPMN online, as a circuit diagram maker, and more. draw.io can import .vsdx, Gliffy™ and Lucidchart™ files .
noun. a figure, usually consisting of a line drawing, made to accompany and illustrate a geometrical theorem, mathematical demonstration, etc. a drawing or plan that outlines and explains the parts, operation, etc., of something: a diagram of an engine. a chart, plan, or scheme.
A diagram is a symbolic representation of information that helps you visualize concepts. It shows the arrangement of ideas or elements and how they relate to one another. Today, you’ll find diagrams in numerous fields, including education, writing, engineering, and marketing.
These free diagram templates utilize colors, infographics, and unique designs to vividly communicate your story. Explore a variety of flowchart templates of PowerPoint. Use a diagram template to lead your client through a process, communicate causes and effects, map out a reporting structure, and more. PowerPoint SmartArt templates transform blocks of copy or bulleted lists into simple but powerful visuals that enhance your presentations and engage your audience.
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noun. Definition of diagram. as in illustration. something that visually explains or decorates a text the explanation of the process of photosynthesis is accompanied by a very useful diagram.
A diagram is a symbolic representation of information using visualization techniques. Diagrams have been used since prehistoric times on walls of caves , but became more prevalent during the Enlightenment . 
An architectural diagram is a visual representation that maps out the physical implementation for components of a software system. It shows the general structure of the software system and the associations, limitations, and boundaries between each element. Software environments are complex—and they aren’t static.