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English definition of “if”

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if

conjunction  /ɪf/ us  

if conjunction (IN THAT SITUATION)

used to say that a particular thing can or will happen when, only when, or after something else happens or becomes true: We’ll have the party in the backyard if the weather’s good. If anyone calls for me, just say I’ll be back at 4 o’clock. Would you mind if I opened the window (= May I open it)? If is also used to talk about the amount or degree of something: This time of year we get little, if any, rain (= almost none). If can mean when: If I don’t have a cup of coffee in the morning, I’m useless. If can also mean in case it is true that: I’m sorry if I’ve offended you.if it weren't for When you say if it weren't for or ( also if it hadn't been for)something, you mean if it were not true or had not happened, the situation would be different: If it weren’t for your help, we would never have finished in time.

if conjunction (WHETHER)

(used to introduce a clause, often when reporting what someone else said) whether: Mrs. Kramer called to ask if her cake was ready.

if

noun [C]  /ɪf/ us  

if noun [C] (UNCERTAIN SITUATION)

something that is not yet certain or not yet decided: The plan contains a lot of ifs.
(Definition of if from the Cambridge Academic Content Dictionary © Cambridge University Press)
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