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A parameter is

[a] quantity which may have various values, each fixed within the limits of a stated case or discussion.[1]
[a] determining factor or characteristic. Usually related to performance in developing a system.[2]
[a] value that is used to control the operation of a function or that is used by a function to compute one or more outputs.[3]


A parameter is

[a] special kind of variable, used in a subroutine to refer to one of the pieces of data provided as input to the subroutine. The semantics for how parameters can be declared and how the arguments get passed to the parameters of subroutines are defined by the language, but the details of how this is represented in any particular computer system depend on the calling conventions of that system.[4]


  1. Electronic Warfare and Radar Systems Engineering Handbook 10-1.19 (Apr. 1, 1997) (full-text).
  2. Defense Acquisition University, Glossary, at B-130 (13th ed. Nov. 2009) (full-text).
  3. NIST Special Publication 800-152, at 133.
  4. Project Open Data, Glossary (full-text).

See also[]