Ielts Vocabulary English Vocabulary Lesson 18 Ielts Exams Preparation 181-Decile (Noun) Definition: each of ten equal groups into which a population can be divided according to the distribution of values of a particular variable. Usage: The lowest income decile of the population. 182-Conceal (Verb) Definition: not allow to be seen; hide. Synonyms: hide, keep out … Continue reading Ielts Vocabulary English Vocabulary Lesson 18 Ielts Exams Preparation