Definitions from Wiktionary ( )

▸ noun:  A value kept constant during an experiment, equation, calculation, or similar, but varied over other versions of the experiment, equation, calculation, etc.
▸ noun:  (sciences) A variable that describes a property or characteristic of some system (material, object, event, etc.) or some aspect thereof.
▸ noun:  (statistics) Any measured quantity of a statistical population that summarises or describes an aspect of the population.
▸ noun:  (machine learning) A variable of a model that is trained by a machine learning algorithm.
▸ noun:  (programming) An input variable of a function definition, that gets an actual value (argument) at execution time.
▸ noun:  (programming, loosely) An actual value given to such a formal parameter.
▸ noun:  A characteristic or feature that distinguishes something from others.
▸ noun:  (geometry) 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.
▸ noun:  (crystallography) The ratio of the three crystallographic axes which determines the position of any plane.
▸ noun:  (crystallography) The fundamental axial ratio for a given species.
▸ noun:  (commutative algebra) Clipping of uniformizing parameter. [(commutative algebra) An element of a discrete valuation ring which generates the unique maximal ideal.]

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