The word "volitional" refers to something that is done or chosen willingly, with intention, or under one's own control. It is related to our ability to make conscious decisions and take purposeful actions. Full definition
Once the drinking has passed a certain point and is out of volitional control, it becomes a sickness. (religion-online.org)
What's new is that we have been able to use this artificial neuronal connection bypassing the lesion site to restore volitional control of the subject's own paretic arm. (sciencedaily.com)
Beverly's volitional memory has to inhibit her will to say something before Friday and to see that she waits until the right moment at the meeting to most effectively interject her ideas. (scientificamerican.com)