What is block diagram? definition and meaning Definition of block diagram: Composition of different shapes and lines showing how the components of a program, process, or system are related to, and depend upon, one another. It may also show how the system operates, Tamil Meaning of Block Diagram - திண்ம Tamil Meaning of Block Diagram. Thanks for using this online dictionary, we have been helping millions of people improve their use of the TAMIL language with its free online services. How to say "block diagram" in Tamil Need to translate "block diagram" to Tamil? Here are 2 ways to say it. BLOCK | meaning in the Cambridge English Dictionary block definition: 1. the distance along a street from where one road crosses it to the place where the next road. Learn more.