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

The company said it is also releasing 1-bit Bonsai 4 billion parameter and 1.7 billion parameter models, with 0.5 gigabytes and 0.24 gigabytes memory footprints, and even higher intelligence density.

From The Wall Street Journal ● Mar. 31, 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

In this model, a parameter known as α emerges when the coupling constants -- the quantities describing the strength of fundamental forces -- are allowed to evolve.

From Science Daily ● Nov. 6, 2025

Each time he adjusted even a single parameter, it could take days of extra computation to see the results.

From Science Daily ● Oct. 30, 2025

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

At 2.8 trillion parameters, it will be the largest open-weight model.

From The Wall Street Journal ● Jul. 26, 2026

Kimi K3 has 2.8 trillion parameters, 50 billion of which are active.

From MarketWatch ● Jul. 21, 2026

AI system parameters work like brain cells: The more a model has, the more knowledge it can store, making the count a shorthand for a model’s capabilities.

From The Wall Street Journal ● Jul. 20, 2026

As AI models get larger, the need for memory will grow to support more parameters, Wedbush analyst Matt Bryson said.

From MarketWatch ● Jul. 20, 2026

“Today, you shall lay the groundwork for my next gleaning,” Scythe Faraday told him, then gave him a list of parameters that tomorrow’s subject should have.

From "Scythe" by Neal Shusterman

Related Words

• criterion
• framework
• guideline
• restriction
• specification