noun (used with a singular verb) Psychology.
the measurement of mental traits, abilities, and processes.

1850–55; psycho- + -metrics Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
psychometrics (ˌsaɪkəʊˈmɛtrɪks)
1.  the branch of psychology concerned with the design and use of psychological tests
2.  the application of statistical and mathematical techniques to psychological testing

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

psychometrics psy·cho·met·rics (sī'kə-mět'rĭks)
The branch of psychology that deals with the design, administration, and interpretation of quantitative tests for the measurement of psychological variables such as intelligence, aptitude, and personality traits. Also called psychometry.

psy'cho·met'ric or psy'cho·met'ri·cal adj.
The American Heritage® Stedman's Medical Dictionary
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Example sentences
And others are engaged in the project of psychometrics.
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