if - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “if”

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if

conjunction  us   /ɪf/

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]  us   /ɪf/

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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