Definitions for "Covariate"
A variable that is related to or associated with the study variable(s) of interest.
an independent situation, which is free to vary
an interval-level independent
A variate occurring concomitantly with the variate of primary interest and measured for the purpose of making informed adjustments on the variate of primary interest (e.g., measuring pretest performance of two groups in order to adjust their posttest scores so that they take account of differences between groups that existed prior to the treatment of one of the groups).
Keywords:  parameter, related, another
The parameter which is related to another parameter.