compulsoryrequired by law or a rule; obligatoryIn many countries, education is compulsory for children between the ages of six and sixteen.NoteIn many countries, education is compulsory for children between the ages of six and sixteen.Elon.io is an online learning platformWe have an entire course teaching IELTS Vocabulary — Band 7+ grammar and vocabulary.Start learning IELTS Vocabulary — Band 7+ now