A variable that describes some system (material, object, event, etc.) or some aspect thereof.
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.
The fundamental axial ratio for a given species.
An actual value given to such a formal parameter.
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.
A statement (in domain specific terms) which specifies a verifiable constraint on an implementation that it shall undeniably meet or (a) be deemed unacceptable, or (b) result in implementation failure, or (c) result in system failure.
Something asked.
A necessity or prerequisite; something required or obligatory. Its adpositions are generally of in relation to who or what has given it, on in relation to whom or what it is given to, and for in relation to what is required.