a. [f. prec. + -AL 1.] Of, pertaining to, or of the nature of bisection. Bisectionally adv., by bisection, so as to divide into two equal parts.
1809. Troughton, in Phil. Trans., XCIX. 109. How to render the usual divisions of the quadrant bisectional. Ibid., 110. Contrived the means of dividing bisectionally.
