Synonyms of required in English:

required


See definition of require

adjective

1‘the book is required reading for everyone interested in philosophical thought’

SYNONYMS
essential, vital, indispensable, necessary, needed, called for, requisite, prerequisite
compulsory, obligatory, mandatory, prescribed, statutory
recommended, set
de rigueur
ANTONYMS

optional, inessential

2‘cut the cable to the required length’

SYNONYMS
desired, preferred, chosen, selected
correct, proper, right