must - definition, thesaurus and related words from WordNet-Online

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Adjective must has 1 sense

must - highly recommended; "a book that is must reading"
Antonyms: inessential, unessential (indirect, via essential)

Noun must has 3 senses

must - a necessary or essential thing; "seat belts are an absolute must"
--₁ is a kind of necessity, essential, requirement, requisite, necessary
must - grape juice before or during fermentation
--₂ is a kind of grape juice
mustiness, must, moldiness - the quality of smelling or tasting old or stale or mouldy
--₃ is a kind of staleness