Webster's English Dictionary

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if

1. if \(.)if, *f\ cj [ME, fr. OE gif; akin to OHG ibu if] 1a: in the event 
   that  1b: allowing that  1c: on condition that  2: WHETHER {asked ~ the 
   mail had come}  3: - used as a function word to introduce an exclamation 
   expressing a wi sh {~ it would only rain} 4: even though {an interesting ~ 
   untenable argument} 
2. if \'if\ n 1: CONDITION, STIPULATION  2: SUPPOSITION