- happening or likely to happen in an unplanned or subordinate conjunction with something else.
- incurred casually and in addition to the regular or main amount: incidental expenses.
- likely to happen or naturally appertaining (usually followed by to).
- something incidental, as a circumstance.
- minor expenses.
- happening in connection with or resulting from something more important; casual or fortuitous
- found in connection (with); related (to)
- caused (by)
- occasional or minor
- an incidental or minor expense, event, or action
