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Computing (FOLDOC) dictionary (also found in English - English (Wordnet), )
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programming, library (Or "copy member", "copy module") A
common piece of source code designed to be copied into many
source programs, used mainly in IBM DOS mainframe
In mainframe DOS (DOS/VS, DOS/VSE, etc.), the copybook
was stored as a "book" in a source library. A library was
comprised of "books", prefixed with a letter designating the
language, e.g., for Assembler, for Cobol, etc.,
because DOS didn't support multiple libraries, private
libraries, or anything. This term is commonly used by COBOL
programmers but is supported by most mainframe languages.
The IBM OS series did not use the term "copybook", instead
it referred to such files as "libraries" implemented as
"partitioned data sets" or PDS.