/ ˌfʌndəˈmentəlɪzəm; NAmE / noun [ U ]
1.
the practice of following very strictly the basic rules and teachings of any religion
2.
(in Christianity) the belief that everything that is written in the Bible is completely true
► fun·da·men·tal·ist / -ɪst; NAmE / noun
► fun·da·men·tal·ist /-ɪst/ adjective
For more information see the Cultural Guide