required
/ri-ˈkwī(-ə)rd/ (ame, mw)
required — adjective
- requiredpositive
- more requiredcomparative
- most requiredsuperlative
1. needed or demanded by a rule, law, or official instruction — for example, a cour
needed or demanded by a rule, law, or official instruction — for example, a course you must take, a document you must provide, or equipment you must have.
All students at this school must wear the required uniform every day.
required + noun (uniform)
Mei submitted all the required documents for her visa application.
The required safety training takes about two hours to complete.
Passengers without the required travel documents cannot board the plane.
Dr. Okafor checked that all the required medicine was available at the clinic.
- mandatory
stronger and more formal; used for legal or official rules
- necessary
broader meaning — can refer to practical need, not just rules
- obligatory
formal; suggests a moral or social duty rather than a written rule
- compulsory
commonly used with courses, military service, or legal requirements
- optional
something you can choose to do or not do
- unnecessary
not needed for any reason
文法句型
required + noun
用法筆記
Frequently placed directly before a noun ('the required documents', 'required training'). Not normally used with degree intensifiers like 'very' — 'very required' sounds unnatural. Use 'strictly required' or 'absolutely required' instead to show strong necessity.