if and only if

连词 conj.
中文释义
英 /ɪf ən(d)ˈəʊn.li ɪf/    美 /ɪf ən(d)ˈoʊn.li ɪf/

英文释义

连词 conj.
  1. Is equivalent to; implies and is implied by; is true and false in the same cases as.
    — A rectangle is a square if and only if all four of its sides have the same length.
  2. Synonym of if (with added intensity) broadly,informal
    — I'll let you go to the concert if and only if you clean your room.

词汇关系

上位词
logical connective
相关词
if if and when iff only if when and only when ↔ ⇔
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