incidental

Universal Words adjective, noun adjective 1 ~ (to sth) happening in connection with sth else, but not as important as it, or not intended: The discovery was incidental to their main research. * incidental music (= music used with a play or a film / movie to give atmosphere) * You may be able to get help with incidental expenses (= small costs that you get in connection with sth). 2 ~ to sth (technical) happening as a natural result of sth: These risks are incidental to the work of a firefighter. noun [usuallypl.] something that happens in connection with sth else, but is less important: You'll need money for incidentals such as tips and taxis.