›happening by chance, or in connection with something else that is more important: it is incidental thatIt is purely incidental that payroll savings were realized after the consolidation, because more employees chose to quit their jobs rather than follow them to the new headquarters.It is not incidental that the financial industry is one of the last remaining consumers of mainframe computers.incidental to sthWhether one is 25 or 75, age is incidental to how well the job is done.
›ACCOUNTINGincidental costs are amounts of money, usually small, that someone has to spend while trying to achieve something: incidental costs/expenses