a. Math. [f. CO- + -gredient, as in L. con-gredientem, f. gradi to step.] lit. Proceeding step by step with each other, keeping step together; said of two or more sets of variables which undergo identical or parallel linear transformations.
1881. Burnside & Panton, Theory Equations (1886), 357. When x, y and x′, y′ are transformed similarly, as in the present Proposition, they are said to be cogredient variables.
