Something that identifies or uniquely points to something or someone else.
One who identifies as a particular type or role; one who says and believes that they are a certain thing.
A formal name used in source code to refer to a variable, function, procedure, package, etc. or in an operating system to refer to a process, user, group, etc.
A primary key.
Someone who identifies; a person who establishes the identity of someone or something.
A guidebook that helps determine the specific class of an object (such as a mushroom, herb, fish, bird, drug, or mineral), or its individual identity (such as that of a star).
A code that distinguishes a particular element from all other elements in a document.
A characteristic or feature that distinguishes something from others.
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 variable that describes some system (material, object, event, etc.) or some aspect thereof.
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.