facultative

mastery
UK /ˈfæ.kəl.tə.tɪv/ US /ˈfæ.kəlˌteɪ.tɪv/adj

card 1 of 7 · synonym

Which word is closest in meaning to 'facultative' in this sentence?

Attendance at the workshop is facultative; employees may choose to participate based on their interest.