metric āļāļ·āļāļāļ°āđāļĢ metric āļāļ·āļāļāļ°āđāļĢ Of or relating to the meter or the metric system: U.S. Customary units and their metric equivalents. A standard of measurement.Mathematics A geometric function that describes the distances between pairs of points in a space.Of or relating to distance.Poetic meter.