Done by conscious, personal choice; not based on external principles.(adjective)
Done intentionally, not by accident(adjective)
Pertaining to volition(adjective)
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Use "volitional" in a sentence
"The first conservative assumption is known as a volitional theory of human nature."
"Reading deliberately undertaken -- what may be called volitional reading -- is no more reading than erudition is culture."
"There is thus a conscious and voluntary way and an involuntary and unconscious way in which mental results may get accomplished; and we find both ways exemplified in the history of conversion, giving us two types, which Starbuck calls the volitional type and the type by self-surrender respectively."