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| indispensable; fundamental; absolutely essential (Юрий Гомон); of the essence (Юрий Гомон); vital | |||
| unexpendable (bigmaxus) | |||
| sine qua non | |||
| absolutely indispensable; absolute indispensable | |||
| mandatory | |||
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| absolutely imperative (It was absolutely imperative that operations be suspended at this terminal. ART Vancouver); absolutely necessary (it is absolutely necessary for all employees to follow these safety rules and safe work procedures. ART Vancouver) | |||
| this is a necessity; this is a must; it is imperative that | |||
| it's imperative (Yeldar Azanbayev) | |||
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| absolute must | |||
| prime necessity | |||
| совершенно необходимое: 20 phrases in 7 subjects |
| Criminal law | 1 |
| Economy | 1 |
| General | 12 |
| Makarov | 2 |
| Mathematics | 2 |
| Scientific | 1 |
| Slang | 1 |