An abstract representation, typically including a name and a type, of a parameter expected to be passed to a method or function.
An actual value given to such a formal parameter.
An input variable of a function definition, that gets an actual value (argument) at execution time.
The ratio of the three crystallographic axes which determines the position of any plane.
A characteristic or feature that distinguishes something from others.
A variable that describes some system (material, object, event, etc.) or some aspect thereof.
The fundamental axial ratio for a given species.
A variable of a model that is trained by a machine learning algorithm.
A value kept constant during an experiment, equation, calculation, or similar, but varied over other versions of the experiment, equation, calculation, etc.
Any measured quantity of a statistical population that summarises or describes an aspect of the population.
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.