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-metrics

a combining form with the meaning “the science of measuring” that specified by the initial element: biometrics; econometrics.

Origin:
see -metric, -ics

metric

2 [me-trik]
adjective
1.
pertaining to distance: metric geometry.
noun
3.
Mathematics. a nonnegative real-valued function having properties analogous to those of the distance between points on a real line, as the distance between two points being independent of the order of the points, the distance between two points being zero if, and only if, the two points coincide, and the distance between two points being less than or equal to the sum of the distances from each point to an arbitrary third point.

Origin:
1750–60; < Latin metricus < Greek metrikós of, relating to measuring. See meter2, -ic

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
metric (ˈmɛtrɪk)
 
adj
1.  of or relating to the metre or metric system
2.  maths denoting or relating to a set containing pairs of points for each of which a non-negative real number ρ(x, y) (the distance) can be defined, satisfying specific conditions
 
n
3.  maths the function ρ(x, y) satisfying the conditions of membership of such a set (a metric space)

metrics (ˈmɛtrɪks)
 
n
(functioning as singular) prosody the art of using poetic metre

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

metric
"pertaining to the system of measures based on the meter," 1864, from Fr. métrique, from mèter (see meter (2)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

metric met·ric1 (mět'rĭk)
adj.
Of or relating to the meter or the metric system.

-metrics suff.
The application of statistics and mathematical analysis to a field of study: biometrics.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
metric   (mět'rĭk)  Pronunciation Key 
Relating to the meter or the metric system.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The narrow-minded focus on attendance in your article reflects an outdated view
  of museum metrics.
He introduced merit pay for public workers and performance metrics for state
  agencies.
Human behavior unfortunately is a poor scale for balanced objectivity and
  metrics.
And in the science world the metrics include publications and citations.
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