compulsory

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

required by rule
- in most schools physical education is compulsory
- attendance is mandatory
- required reading
• Syn:
mandatory, required
• Similar to:
obligatory
• Derivationally related forms:
mandate (for: mandatory)

• Từ đồng nghĩa / Synonyms:
  mandatory, required