Meaning of MUST in English

v. 1 ought (to), should, have to, be obliged or obligated to, be compelled or forced to, be required to I must get this work done before lunch-time Must you go? Yes, I must.

n. 2 necessity, requisite, requirement, obligation, sine qua non, essential Patience is an absolute must in this job

Oxford thesaurus English vocab.      Английский словарь Оксфорд тезаурус.