
In the field of translation, a translation unit is a segment of a text which the translator treats as a single cognitive unit for the purposes of establishing an equivalence. The translation unit may be a single word, a phrase, one or more sentences, or even a larger unit. When a translator segments a text into translation units, the larger these ...
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http://en.wikipedia.org/wiki/Translation_unit
[programming] In C programming language terminology, a translation unit is the ultimate input to a C compiler from which an object file is generated. In casual usage it is sometimes referred to as a compilation unit. A translation unit roughly consists of a source file after it has been processed by the C preprocessor, meaning that header f...
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http://en.wikipedia.org/wiki/Translation_unit_(programming)

a part of a program that can be separately compiled. TC++PL 9.1.
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http://www.stroustrup.com/glossary.html
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