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required (adj.)

"that must be done as a condition," c. 1600, past-participle adjective from require (v.). Required reading, that which must be read to attain an understanding of a subject, is attested from 1881.

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Definitions of required from WordNet

required (adj.)
required by rule;
required reading
Synonyms: compulsory / mandatory
required (adj.)
necessary for relief or supply;
Synonyms: needed / needful / requisite
From wordnet.princeton.edu