hviss

== Danish == === Pronunciation === Read as "hvis og kun hvis" === Conjunction === hviss (mathematics) iff (if and only if) Synonym: omm (om og kun om) == Norwegian == === Pronunciation === Read as "hvis og bare hvis" === Conjunction === hviss (mathematics) iff (if and only if) Synonym: omm (om og bare om) == Old Norse == === Etymology === (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.) === Interjection === hviss whew! === Further reading === Zoëga, Geir T. (1910), “hviss”, in A Concise Dictionary of Old Icelandic, Oxford: Clarendon Press; also available at the Internet Archive