Oxford Dictionary English compound interest nounnoun BrE BrE//ˌkɒmpaʊnd ˈɪntrəst// ; NAmE NAmE//ˌkɑːmpaʊnd ˈɪntrəst// ; BrE BrE//ˌkɒmpaʊnd ˈɪntrest// ; NAmE NAmE//ˌkɑːmpaʊnd ˈɪntrest// [uncountable] Add to my wordlistjump to other resultsinterest that is paid both on the original amount of money saved and on the interest that has been added to it compare simple interestSee compound interest in the Oxford Advanced American DictionaryCheck pronunciation: compound interest oxfordlearnersdictionaries.com