adv. 25B6; adverb OF ONE'S OWN FREE WILL, of one's own accord, of one's own volition, by choice, by preference; willingly, readily, freely, intentionally, deliberately, on purpose, purposely, spontaneously; gladly, with pleasure.
VOLUNTARILY
Meaning of VOLUNTARILY in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012