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    momentous

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    momentous
    mo‧men‧tous /məʊˈmentəs, mə- $ moʊ-, mə-/ adjective
     Word Family: noun: moment, momentum; adjective: momentary, momentous; adverb: momentarily
    a momentous event, change, or decision is very important because it will have a great influence on the future:
        a momentous decision
        Momentous events are taking place in the US.
        His colleagues all recognized that this was a momentous occasion.
        one of the most momentous days in British sport
         
    THESAURUS
    ■ very important
       ▪ essential very important, especially for the success, health, or safety of someone or something: It is essential to speak the local language. | essential supplies of food and clothing
       ▪ vital/crucial extremely important, because without it there could be serious problems: His evidence was vital to the case. | The US plays a crucial role in the region. | The media are a vital part of the political system.
       ▪ key extremely important and having a big effect: Wheeler had a key role in the development of the atom bomb. | Timing is key.
       ▪ of great/considerable importance very important: In the construction industry, health and safety are of considerable importance.
       ▪ momentous very important because it has a very great effect on the future: Momentous events were taking place in Russia. | a momentous decision