REQUIRED
compulsory, mandatory, required
(adjective) required by rule; “in most schools physical education is compulsory”; “attendance is mandatory”; “required reading”
needed, needful, required, requisite
(adjective) necessary for relief or supply; “provided them with all things needful”
Source: WordNet® 3.1
Verb
required
simple past tense and past participle of require
Adjective
required (comparative more required, superlative most required)
Necessary; obligatory; mandatory.
Source: Wiktionary
REQUIRE
Re*quire" (r-kwr"), v. t. [imp. & p. p. Required (-kwrd"); p. pr. &
vb. n. Requiring.] Etym: [OE. requeren, requiren, OF. requerre, F.
requ; L. pref. re- re- + quaerere to ask; cf. L. requirere. See
Query, and cf. Request, Requisite.]
1. To demand; to insist upon having; to claim as by right and
authority; to exact; as, to require the surrender of property.
Shall I say to Cæsar What you require of him Shak.
By nature did what was by law required. Dryden.
2. To demand or exact as indispensable; to need.
just gave what life required, and gave no more. Goldsmith.
The two last [biographies] require to be particularly noticed. J. A.
Symonds.
3. To ask as a favor; to request.
I was ashamed to require of the king a band of soldiers and horsemen
to help us against the enemy in the way. Ezra viii. 22.
Syn.
– To claim; exact; enjoin; prescribe; direct; order; demand; need.
Source: Webster’s Unabridged Dictionary 1913 Edition