proficiencya high degree of skill or competence in a particular areaLanguage proficiency is often measured through standardised tests such as IELTS.NoteLanguage proficiency is often measured through standardised tests such as IELTS.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