Exxon spent $2.2 billion on the cleanup and voluntarily paid $300 million to Alaskans affected by the spill.
These young adults have voluntarily checked out of a political system they consider corrupt and dysfunctional.
He has cooperated fully with authorities and voluntarily testified before the grand jury for several hours.
late 14c. (implied in voluntarily), from Latin voluntarius "of one's free will," from voluntas "will," from the ancient accusative singular present participle of velle "to wish" (see will (v.)). Originally of feelings, later also of actions (mid-15c.).
voluntary vol·un·tar·y (vŏl'ən-těr'ē)
Arising from or acting on one's own free will.
Normally controlled by or subject to individual volition, as of respiration.
Capable of making choices; having the faculty of will.