metric

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

A function for the 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) "non-negativity": d(x,y) \ge 0 , (2) "identity of indiscernibles": d(x,y) = 0 \mbox{ iff } x=y , (2) "symmetry": d(x,y) = d(y,x) , and (3) "triangle inequality": d(x,y) \le d(x,z) + d(z,y) .

A metric tensor.

(aerospace, systems engineering) To measure or analyse statistical data concerning the quality or effectiveness of a process.

Of or relating to the metric system of measurement.

Of or relating to the meter of a piece of music.

Of or relating to distance.

The system of measurements developed in France in the 1790s and now used worldwide.

The modern version of that system, Systeme Internationale d'Unites (International System of Units), or SI system of measurements that is based on the base units of the meter/metre, the kilogram, the second, the ampere, the kelvin, the mole, and the candela.

Any variant of that system, that was not codified as SI, such as cgs.