Open English Wordnet
Nouns
(n)metric function, metrica function of a topological space that gives, for any two points in the space, a value equal to the distance between them
(n)metric unit, metrica decimal unit of measurement of the metric system (based on meters and kilograms and seconds)“convert all the measurements to metric units”, “it is easier to work in metric”
(n)system of measurement, metrica system of related measures that facilitates the quantification of some particular characteristic