Obs. rare. [sb. of action f. L. coæquāre to make equal with one another: cf. CO- 3 a, and EQUATION.] The action of making coequal or of equalizing together.
1471. Ripley, Comp. Alch., IV. in Ashm. (1652), 144. Or of Pryncypylls a coequacyon as other tells.
a. 1691. Boyle, Wks., III. 302 (R.). If all the extant parts of a [physical] superficies be so depressed to a level with the rest, that there is a coæquation, if I may so speak, made of all the superficial parts of a body.
