adv. freely, willingly, spontaneously, of (one's) own free will, on (one's) own (initiative or recognizance or responsibility), without prompting, without being prompted or asked, gratis, gratuitously; by choice, intentionally, purposely, on purpose, deliberately Some of the students spent their summer vacation voluntarily helping the needy
VOLUNTARILY
Meaning of VOLUNTARILY in English
Oxford thesaurus English vocab. Английский словарь Оксфорд тезаурус. 2012