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parameter.

A value kept constant during an experiment, equation, calculation, or similar, but varied over other versions of the experiment, equation, calculation, etc.

9 characters4 syllables approx.English language

Meaning & usage

noun/pəˈɹæm.ɪ.tə/UK/pəˈɹæm.ə.tɚ/US[pəˈɹæm.ə.ɾɚ]US
  1. A value kept constant during an experiment, equation, calculation, or similar, but varied over other versions of the experiment, equation, calculation, etc.

  2. A variable that describes a property or characteristic of some system (material, object, event, etc.) or some aspect thereof.

  3. A variable that describes a property or characteristic of some system (material, object, event, etc.) or some aspect thereof. Any measured quantity of a statistical population that summarises or describes an aspect of the population.

  4. A variable that describes a property or characteristic of some system (material, object, event, etc.) or some aspect thereof. A variable of a model that is trained by a machine learning algorithm.

  5. An input variable of a function definition, that gets an actual value (argument) at execution time.

  6. An actual value given to such a formal parameter.

    broadly
  7. A characteristic or feature that distinguishes something from others.

  8. In the ellipse and hyperbola, a third proportional to any diameter and its conjugate, or in the parabola, to any abscissa and the corresponding ordinate.

    The parameter of the principal axis of a conic section is called the latus rectum.
  9. Clipping of uniformizing parameter.

    abbreviation · alt-of · clipping
  10. The ratio of the three crystallographic axes which determines the position of any plane.

  11. The fundamental axial ratio for a given species.

Where this word comes from

From French paramètre, from New Latin parametrum (“parameter”), from Ancient Greek παρα- (para-, “beside”) + μέτρον (métron, “measure”).

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.