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voluntary
mastery UK /ˈvɒl.ən.tɹi/ US /ˈvɑ.lənˌt(ɛ)ɹi/adjnounadv
card 1 of 10 · synonym
Which word is closest in meaning to 'voluntary' in this sentence?
Participation in the study is entirely voluntary.
card 1 of 10 · synonym
Which word is closest in meaning to 'voluntary' in this sentence?
Participation in the study is entirely voluntary.