1. Computer Definition [Design?] Language. A hardware description language. "Computer Organisation and Microprogramming", Yaohan Chu, P-H 1970. 2. Command Definition Language. Portion of ICES used to implement commands. Sammet 1969, p.618-620. 3. Compiler Description Language. C.H.A. Koster, 1969. Intended for implementation of the rules of an affix grammar by recursive procedures. A procedure may be a set of tree-structured alternatives, each alternative is executed until one successfully exits. Used in a portable COBOL-74 compiler from MPB, mprolog system from SzKI, and the Mephisto chess computer. "CDL: A Compiler Implementation Language", in Methods of Algorithmic Language Implementation, C.H.A. Koster, LNCS 47, Springer 1977, pp.341-351. "Using the CDL Compiler Compiler", C.H.A. Koster, 1974. Versions: CDL2, CDLM used at Manchester. 4. Common Design Language. "Common Design Language", IBM, Software Engineering Inst, Sept 1983. 5. Control Definition Language. Ideas which contributed to Smalltalk. ["Control Structures for Programming Languges", David A. Fisher, PhD Thesis, CMU 1970].

Controlled digital lending (CDL) is a model by which libraries digitize materials in their collection and make them available for lending. It is based on interpretations of the United States copyright principles of fair use and copyright exhaustion.

The American Society of Cinematographers Color Decision List (ASC CDL) is a format for the exchange of basic primary color grading information between equipment and software from different manufacturers. The format defines the math for three functions: Slope, Offset and Power.