若且唯若 [－－－－]

Jyutping joek6 ce2 wai4 joek6
Pinyin ruò qiě wéi ruò

Definitions (CC-CEDICT)
  1. if and only if
Definitions (Wiktionary)
  1. conj, Taiwan
    if and only if
    (syn.) 當且僅當, 当且仅当