NTUMC+ Open Multilingual Wordnet 0.9

可省却, 非必要, 可省却, 可选

dispensability, dispensableness

the quality possessed by something that you can get along without

可选择, 选择性, 随意+的, 可选+的, 随意, 可选, 非必须, 非必须+的, 可选择+的, 非必须

optional

possible but not necessary; left to personal choice

Czech	Chinese (simplified)	English	Indonesian	Italian
Japanese	Yue Chinese	Malaysian