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covariate

[koh-vair-ee-it, ‐eyt] /koʊˈvɛər i ɪt, ‐ˌeɪt/
noun, Statistics.
1.
a continuous control variable that is observed rather than manipulated but can affect the outcome of an experiment or study:
You need to adjust for education level and other covariates in interpreting the results.
Origin
1965-1970
1965-70; co- + variate
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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