must

Noun
  1. A necessary or essential thing (synset 109386867)
    "seat belts are an absolute must"
    is a type of: essential, necessary, necessity, requirement, requisite - anything indispensable
  2. Grape juice before or during fermentation (synset 107940895)
    is a type of: grape juice - the juice of grapes
  3. The quality of smelling or tasting old or stale or mouldy (synset 104935371)
    is a type of: staleness - having lost purity and freshness as a consequence of aging
    same as: moldiness, mustiness
Adjective
  1. Highly recommended (synset 300904721)
    "a book that is must reading"
    similar to: essential - basic and fundamental

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