Noun

(en noun)

(mathematics, physics) A variable kept constant during an experiment, calculation or similar.

(programming) An input variable of a procedure definition, that gets an actual value (argument) at execution time (formal parameter) .

Roughly, a tuple of arguments could be thought of as a vector, whereas a tuple of parameters''' could be thought of as a covector (i.e., linear functional). When a function is called, a '''parameter tuple becomes "bound" to an argument tuple, allowing the function instance itself to be computed to yield a return value. This would be roughly analogous to applying a covector to a vector (by taking their dot product (or, rather, matrix-product of row vector and column vector)) to obtain a scalar.

(programming) An actual value given to such a formal parameter (argument or actual parameter) .

A characteristic or feature that distinguishes something from others.

(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.

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

(crystallography) The ratio of the three crystallographic axes which determines the position of any plane.

(crystallography) The fundamental axial ratio for a given species.

Noun

(en noun)

One of the choices which can be made.

* {{quote-news

, year=2011 , date=October 23 , author=Becky Ashton , title=QPR 1 - 0 Chelsea , work=BBC Sport citation , page= , passage=Luiz struggled with the movement of Helguson in the box, as he collected a long ball and the Spaniard barged him over, leaving referee Chris Foy little option but to point to the spot.}}

* {{quote-magazine, date=2012-01

, author=Steven Sloman , title=The Battle Between Intuition and Deliberation , volume=100, issue=1, page=74 , magazine= citation , passage=Libertarian paternalism is the view that, because the way options' are presented to citizens affects what they choose, society should present ' options in a way that “nudges” our intuitive selves to make choices that are more consistent with what our more deliberative selves would have chosen if they were in control.}}

The freedom or right to choose.

(finance)(legal) A contract giving the holder the right to buy or sell an asset at a set strike price; can apply to financial market transactions, or to ordinary transactions for tangible assets such as a residence or automobile.

(graphical user interface) A button on a screen used to select an action (often "menu option")