parameter

American  

[puh-ram-i-ter] / pəˈræm ɪ tər /

noun

• parameters
  plural

1. Mathematics.

   1. a constant or variable term in a function that determines the specific form of the function but not its general nature, as a in f (x ) = ax, where a determines only the slope of the line described by f (x ).

   2. one of the independent variables in a set of parametric equations.

2. Statistics. a variable entering into the mathematical form of any distribution such that the possible values of the variable correspond to different distributions.

3. Computers. a variable that must be given a specific value during the execution of a program or of a procedure within a program.

4. Usually parameters. limits or boundaries; guidelines.

   the basic parameters of our foreign policy.

5. characteristic or factor; aspect; element.

   a useful parameter for judging long-term success.

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parameter British  

/ pəˈræmɪtə /

noun

1. one of a number of auxiliary variables in terms of which all the variables in an implicit functional relationship can be explicitly expressed See parametric equations

2. a variable whose behaviour is not being considered and which may for present purposes be regarded as a constant, as y in the partial derivative ∂f( x,y )/∂ x

3. statistics a characteristic of the distribution of a population, such as its mean, as distinct from that of a sample Compare statistic

4. informal any constant or limiting factor

   a designer must work within the parameters of budget and practicality

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parameter Cultural  

1. A quantity or number on which some other quantity or number depends. An informal example is, “Depending on the traffic, it takes me between twenty minutes and an hour to drive to work”; here, “traffic” is the parameter that determines the time it takes to get to work. In statistics, a parameter is an unknown characteristic of a population — for example, the number of women in a particular precinct who will vote Democratic.

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Usage

Some object strongly to the use of parameter in these newer senses. Nevertheless, the criticized uses are now well established both in educated speech and in edited writing.

Discover More

The term is often mistakenly used to refer to the limits of possible values a variable can have because of confusion with the word perimeter.

Other Word Forms

Derived Forms

• parametric
  adjective
• parametrical
  adjective

Inflected Forms

Nouns

• parameters
  plural

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Etymology

Origin of parameter

From the New Latin word parametrum, dating back to 1650–60; see para- ¹, -meter

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Explanation

A parameter is a limit. In mathematics a parameter is a constant in an equation, but parameter isn’t just for math anymore: now any system can have parameters that define its operation. You can set parameters for your class debate. Parameter comes from a combination of the Greek word para-, meaning “beside,” and metron, meaning “measure.” The natural world sets certain parameters, like gravity and time. In court, the law defines the parameters of legal behavior. Parameter and perimeter are similar, but a perimeter is the physical distance around an object, while a parameter can contain or define something either physically or abstractly.

Example Sentences

See Examples For:

parameter parameters

Then, pick activities that fit within that parameter.

From MarketWatch ● Sep. 17, 2026

AT&T’s own OTel model, which is an open model customized with telecom-specific data, was tested in 32 different variations of model type and parameter size, Markus said.

From The Wall Street Journal ● Aug. 12, 2026

In other words, different physical processes can produce very similar observable signatures, making it challenging for the AI to correctly identify which parameter is responsible.

From Science Daily ● Jun. 11, 2026

Bonsai 8B is an 8-billion parameter large language model, trained using Google v4 TPUs.

From The Wall Street Journal ● Mar. 31, 2026

Reluctantly, he acquiesced; the test showed that he suffered from elevated levels of serum creatinine with a value way above 1.4, the highest parameter in the normal range.

From "Endgame" by Frank Brady

"AI and social media obviously wasn't a thing when I signed my contract 20 years ago so I'm still trying to understand exactly what those parameters are."

From BBC ● Oct. 29, 2026

“There are literally no parameters in the law that we are aware of that would restrict the installation of these things,” Yukelson said.

From Los Angeles Times ● Oct. 27, 2026

"The next step is to characterize abnormal functional and structural brain states along these pathways to build more detailed models for setting patient-specific stimulation parameters, including amplitude, frequency, and pulse width, for precision medicine."

From Science Daily ● Oct. 18, 2026

It plans to release the weights, or the trained parameters of the model, on Oct.

From The Wall Street Journal ● Oct. 6, 2026

The series of equations we needed to work described the parameters of thrust coefficient, nozzle-throat area, combustion-chamber cross-sectional areas, and velocity of the gases predicted for any particular propellant.

From "October Sky" by Homer Hickam

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