当且仅当當且僅當

dāng qiě jǐn dāng

Meaning

if and only if

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Characters

当dāngappropriate, timely; to act, to serve; the sound of bells⺌彐且qiěmoreover, also (post-subject); about to, will soon (pre-verb)月一仅jǐnonly, merely, solely, just亻又