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if

 
 
/ɪf/ conjunction

Definition

DEPEND used to say that something will happen only after something else happens or is true: We'll have the party in the garden if the weather's good. If you eat up all your dinner you can have some chocolate.
MIGHT used to talk about something that might happen or be true: I'm sorry if I've offended you. What will we do if this doesn't work?
WHETHER whether: I wonder if he'll get the job. Have you asked her if she'd like to come?
ALWAYS used to mean always or every time: If you mention his mother, he always cries.
(Definition of if conjunction from the Cambridge Learner's Dictionary © Cambridge University Press)

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