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English word if comes from Proto-Indo-European *ō-, Proto-Germanic *ja, and later Proto-Germanic *jabai (When, if.)
*ō- (Proto-Indo-European)
*ja (Proto-Germanic)
And (conjunctive particle). Thus, so. Yes (confirmation particle).
*jabą (Proto-Germanic)
*jabai (Proto-Germanic)
When, if.
ġef (Old English)
yef (Middle English)
if (English)
(Discuss([/Wiktionary:Tea_room/2018/March?action=edit§ion=new&preloadtitle=%5B%5Bif%5D%5D +]) this sense) As is the case, since. (computing) In the event that a statement is true (a programming statement that acts in a similar manner).. (sometimes, _, proscribed) Whether; used to introduce a noun clause, an indirect question, that functions as the direct object of certain verbs.. [...]