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if  conj 
1 in case that, or on condition that 
if you try hard it might work  
2 used to introduce an indirect question. In this sense, if approaches the meaning of whether 
3 even though 
an attractive if awkward girl  
4 
a used to introduce expressions of desire, with only 
if I had only known  
b used to introduce exclamations of surprise, dismay, etc. 
if this doesn't top everything!  
5 as if as it would be if; as though 
he treats me as if I were junior to him  
  n 
6 an uncertainty or doubt 
the big if is whether our plan will work at all  
7 a condition or stipulation 
I won't have any ifs or buts  
  (Old English gif; related to Old Saxon ef if, Old High German iba whether, if) 


IF , i.f.  (Electronics)  abbrev. for intermediate frequency