Hello-world meaning

The classic, first program written in a new programming language. Originating in the C and Unix world, the program does nothing more than display "Hello World" on screen. It is often the first lesson in a tutorial, because it demonstrates how much code is necessary to write a simple program.
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(programming) The title of a simple script or program designed to output the text "Hello World" as a demonstration of the computer language or environment.
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(programming, by extension) A simple first program for any purpose.
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