1. happening as a minor part of something else; not planned or intended
2. occurring by chance in connection with something else

1. a minor expense or cost that occurs in addition to the main expense
Usage: usually plural

Examples

• The damage to the car was incidental to the main accident.
• She made some incidental remarks about the weather during her speech.
• Any incidental costs will be covered by the company.
• The meeting of old friends was purely incidental.
• Travel incidentals like meals and parking can add up quickly.
• His comments were incidental to the main discussion.
• The hotel covers room and board but not incidentals.