Diet, exercise ... It's all part of this cult of self-improvement.
3 [singular]a group of people who are very interested in a particular thing:
O'Brien has a cult of devoted readers.
4 [uncountable and countable]formalRRa system of religious beliefs and practices
➔personality cultWORD FOCUS: religion WORD FOCUS: religion faithone of the world's main religions, for example Islam, Hinduism, Buddhism, Judaism, or Christianity churcha Christian religious group, for example the Catholic Church secta religious group that is part of a larger religious group but has slightly different beliefs, for example a Buddhist sect cultan extreme religious group that is not part of an established religion faith communitya group of people living in the same area, who have a particular religion secularnot relating to religion or any religious groupreligion ➔ See alsoreligion
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.