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covariate

[koh-vair-ee-it, ‐eyt]
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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.
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Origin of covariate

First recorded in 1965–70; co- + variate
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018