must modal verb - definition in the Learner's Dictionary - Cambridge Dictionaries Online

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English definition of “must”

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must

modal verb
 
 
strong /mʌst/ weak /məst, məs/
NECESSARY A2 used to say that it is necessary that something happens or is done: The meat must be cooked thoroughly. You mustn't show this letter to anyone else. I must get some sleep.Essential or necessary
LIKELY B2 used to show that you think something is very likely or certain to be true: It must have been very upsetting for her. You must be exhausted. She must be very wealthy.Possible and probable
SUGGEST B1 used to show that you think it is a good idea for someone to do something: You must come and stay with us some time. Suggestions and proposals
(Definition of must modal verb from the Cambridge Learners Dictionary © Cambridge University Press)
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