An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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if and only if (iff)
  اگر و ایواز اگر، ~ ~ تنها ~  
agar va ivâz agar, ~ ~ tanhâ ~
Fr.: si et seulement si  

Logic, Math.: An → expression indicating that two → statements so connected are → necessary and sufficient conditions for one another. The corresponding logical symbols usually used are: ↔, ⇔, ≡, and iff.

See also: → if; → and; → only.