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, ˌpærəˈmɛtrɪk /

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

Etymology

Origin of parameter

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

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

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

“The exchange rate is not a trigger parameter for the ECB.”

From The Wall Street Journal ● Mar. 2, 2026

This parameter controls how predictable or adventurous the generated responses are.

From Science Daily ● Jan. 25, 2026

Based on this parameter, you’ll see Guillermo del Toro’s “Frankenstein” is missing, but a documentary about the master of monsters himself is included.

From Los Angeles Times ● Dec. 22, 2025

So they use parameter to mean a boundary, a characteristic, a component, an element, a feature, an ingredient, a part, a perimeter, a quality, or a requirement.

From "Woe Is I" by Patricia T. O'Conner

The proximate cause is Moonshot AI’s Kimi K3, released last month: 2.8 trillion parameters, the largest open model ever published, benchmarking within reach of the best American proprietary systems.

From The Wall Street Journal ● Aug. 6, 2026

Critics argued that it flew in the face of innocent-before-proven-guilty parameters and that the job of police was to investigate, not adjudicate.

From BBC ● Jul. 31, 2026

Alibaba’s new model has 2.4 trillion parameters, and the company plans to make it open-weight soon for developers to download and modify.

From The Wall Street Journal ● Jul. 20, 2026

If chip clusters get larger due to increasing model parameters, he said that could also offer a boost to networking providers.

From MarketWatch ● Jul. 20, 2026

Once, the Dream’s parameters were caged by technology and by the limits of horsepower and wind.

From "Between the World and Me" by Ta-Nehisi Coates

Related Words

• criterion
• framework
• guideline
• restriction
• specification