required
[adjective]
Synonyms: needed, called for, essential, necessary, obligatory, requisite

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Antonyms: optional

[TahlilGaran] English Synonym Dictionary ▲

required adjective. [rɪ'kwʌɪǝd] E17.
[from REQUIRE verb + -ED¹.]
That is required, requisite, necessary.
required reading literature etc. which must be read for an educational course or in order to gain an understanding of a subject.

► Earlier (LME) in UNREQUIRED.

■ requiredness noun M20.

[TahlilGaran] English Dictionary ▲