Noun

(en noun)

A quantity intended to be measured.

(engineering) An object being measured.

Noun

(en noun)

A measure for something; a means of deriving a quantitative measurement or approximation for otherwise qualitative phenomena (especially used in Software Engineering)

* 2011 , April 10, Financial Times

As for the large number of official statements that Spain is safe, I think they are merely a metric of the complacency that has characterised the European crisis from the start.

* {{quote-magazine, date=2013-08-03, volume=408, issue=8847, magazine=(The Economist)

, title= Boundary problems , passage=Economics is a messy discipline: too fluid to be a science, too rigorous to be an art. Perhaps it is fitting that economists’ most-used metric , gross domestic product (GDP), is a tangle too. GDP measures the total value of output in an economic territory. Its apparent simplicity explains why it is scrutinised down to tenths of a percentage point every month.}}

What metric should be used for performance evaluation?

What are the most important metrics to track for your business?

It's the most important single metric that quantifies the predictive performance.

''How to measure marketing? Use these key metrics for measuring marketing effectiveness.

There is a lack of standard metrics .

(mathematics) A measurement of the "distance" between two points in some metric space: it is a real-valued function d''(''x'',''y'') between points ''x'' and ''y satisfying the following properties: (1) "positive definiteness": $d(x,y)\; \backslash ge\; 0$ and $d(x,y)\; =\; 0\; \backslash mbox\{\; iff\; \}\; x=y$, (2) "symmetry": $d(x,y)\; =\; d(y,x)$, and (3) "triangle inequality": $d(x,y)\; \backslash le\; d(x,z)\; +\; d(z,y)$.

* 2014 , Wikipedia,

In mathematics, a metric' or distance function is a function that defines a distance between elements of a set. A set with a ' metric is called a metric space.