volitionaryadj.
Etymology: < volition n. + -ary suffix1.Previous versions of the OED give the stress as: voˈlitionary.
the mind > will > [adjective] > arising from the will
1890 13 Feb. 358/2 Some experiments which extend our knowledge of volitionary movement.
This entry has not yet been fully updated (first published 1920; most recently modified version published online June 2019).