of one's own volition
• voluntarily.
• "they choose to leave early of their own volition"
Similar:
of one's own free will,
of one's own accord,
of one's own choice,
of one's own choosing,
by choice,
by preference,
by one's own preference,
voluntarily,
willingly,
readily,
freely,
intentionally,
consciously,
deliberately,
on purpose,
purposely,
spontaneously,
without being asked,
without hesitation,
without reluctance,
gladly,
with pleasure,
with good grace,
eagerly,
enthusiastically,
