充要条件 Traditional 充要條件 chōng yào tiáo jiàn 🔊 necessary and sufficient condition + Keep this word Meanings chōng yào tiáo jiàn 充要條件 (logic) necessary and sufficient condition Its characters 充chōngsufficient; fullHSK 7–9要yàoto want; to be going toHSK 1条tiáostripHSK 2件jiàn(measure word for clothes, things)HSK 1