<language, data> The syntax of a language including all the features visible in the source code such as parentheses and delimiters. The concrete syntax is used when parsing the program or other input, during which it is usually converted into some kind of abstract syntax tree (conforming to an abstract syntax).
In communications, concrete syntax is called transfer syntax.
Try this search on Wikipedia, OneLook, Google
Nearby terms: ConCoord « concrete class « Concrete Data Structure « concrete syntax » CONCUR » concurrency » Concurrent C