adj. Function: adjective
1
Synonyms: NEEDFUL , needed, requisite
2
Synonyms: MANDATORY , compulsatory, compulsory, imperative, imperious, obligatory
Antonyms: optional
adj. Function: adjective
1
Synonyms: NEEDFUL , needed, requisite
2
Synonyms: MANDATORY , compulsatory, compulsory, imperative, imperious, obligatory
Antonyms: optional
Merriam Webster. Collegiate thesaurus English dictionary. Английский энциклопедический толковый словарь тезауруса. 2012