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English definition of “if”

if

conjunction     /ɪf/
DEPEND A2 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.Connecting words which express a condition
MIGHT B1 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?Connecting words which express a contrast
WHETHER B1 whether: I wonder if he'll get the job. Have you asked her if she'd like to come?Connecting words which express a condition
ALWAYS B1 used to mean always or every time: If you mention his mother, he always cries.Connecting words which express a condition
(Definition of if conjunction from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “if” in other dictionaries

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