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# parameter

[puh-ram-i-ter] /pəˈræm ɪ tər/
noun
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.
Origin of parameter
1650-1660
From the New Latin word parametrum, dating back to 1650-60. See para-1, -meter
Related forms
parametric
[par-uh-me-trik] /ˌpær əˈmɛ trɪk/ (Show IPA),
Can be confused
boundary, limit, parameter, variable (see synonym study at boundary; see usage note at the current entry)
parameter, perimeter.
Usage note
4, 5. 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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for parameter
Contemporary Examples
• There has to be more than one parameter than happiness to examine your life.

June 7, 2009
Historical Examples
• A considerable amount of variation in this parameter was found in all of the taxa (Table 5).

William E. Duellman
• The two subspecies of H. microcephala agree more closely in this parameter than in fundamental frequency.

William E. Duellman
• The distance between the verbal and the significance of the idea is itself a parameter of the evolution from nature to culture.

• They cover a surface, and the equation of the surface is obtained by eliminating the parameter between the two equations.

British Dictionary definitions for parameter

## parameter

/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
Derived Forms
Word Origin
C17: from New Latin; see para-1, -meter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for parameter
n.

1650s in geometry, from Modern Latin parameter (1630s), from Greek para- "beside, subsidiary" (see para- (1)) + metron "measure" (see meter (n.2)).

A geometry term until 1920s when it yielded sense of "measurable factor which helps to define a particular system" (1927). Common modern meaning (influenced by perimeter) of "boundary, limit, characteristic factor" is from 1950s. Related: Parametric.

Online Etymology Dictionary, © 2010 Douglas Harper
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parameter in Medicine

parameter pa·ram·e·ter (pə-rām'ĭ-tər)
n.

1. One of a set of measurable factors, such as temperature and pressure, that define a system and determine its behavior and are varied in an experiment.

2. A factor that determines a range of variations; a boundary.

3. A statistical quantity, such as a mean or standard deviation of a total population, that is calculated from data and describes a characteristic of the population as opposed to a sample from the population.

4. A psychoanalytic tactic, other than interpretation, used by the analyst to further the patient's progress.

5. A factor that restricts what is possible or what results. Not in technical use.

6. A distinguishing characteristic or feature. Not in technical use.

The American Heritage® Stedman's Medical Dictionary
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parameter in Culture
parameter [(puh-ram-uh-tuhr)]

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.

Note: 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.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
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### Word Value for parameter

13
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