Definitions
1.nounA measure for something; a means of deriving a quantitative measurement or approximation for otherwise qualitative phenomena (especially used in engineering)."How to measure marketing? Use these key metrics for measuring marketing effectiveness."
2.nounA 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) .
3.nounA metric tensor.
4.verb(aerospace, systems engineering) To measure or analyse statistical data concerning the quality or effectiveness of a process."Customer satisfaction was metricked by the marketing department."
5.nounThe system of measurements developed in France in the 1790s and now used worldwide.
6.nounThe 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.
7.nounAny variant of that system, that was not codified as SI, such as cgs.
8.nounThe study of metrical verse.
9.nounThe statistical analysis of data sets or big data.
10.nounThe theory of measurement.