
In computer science, a preprocessor is a program that processes its input data to produce output that is used as input to another program. The output is said to be a preprocessed form of the input data, which is often used by some subsequent programs like compilers. The amount and kind of processing done depends on the nature of the preprocessor; ...
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http://en.wikipedia.org/wiki/Preprocessor
[CAE] In Computer aided engineering (CAE) a preprocessor is a program which provides a Graphical user interface (GUI) to define physical properties. This data is used by the subsequent computer simulation. ...
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http://en.wikipedia.org/wiki/Preprocessor_(CAE)

the part of a C++ implementation that removes comments, performs macro substitution and #includes. Avoid using the preprocessor whenever possible. See also: macro, #include, inline, const, template, namespace. TC++PL 7.8, 9.2.1, D&E 18.
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http://www.stroustrup.com/glossary.html

a program that performs some type of processing, as organization of data or preliminary computation, in advance of another program that will perform most of the processing.
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https://www.infoplease.com/dictionary/preprocessor
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