What is the meaning of Metric?

Of or relating to the metric system of measurement.

Of or relating to measurement by meters or by metrics.

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

Of or relating to distance.

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

Ellipsis of metric system.

A function which satisfies a particular set of formal conditions, created to generalize the notion of the distance between two points. Formally, a real-valued function ${\displaystyle d}$ on ${\displaystyle M\times M}$, where ${\displaystyle M}$ is a set, is called a metric if (1) ${\displaystyle d(x,y)=0}$ if and only if ${\displaystyle x=y}$, (2) ${\displaystyle d(x,y)=d(y,x)}$ for all pairs ${\displaystyle (x,y)}$, and (3) ${\displaystyle d}$ obeys the triangle inequality.

A metric tensor.

To measure or analyse statistical data concerning the quality or effectiveness of a process.

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Source: wiktionary.org