incidental

adj

1. Loosely associated; of limited relevance except indirectly; only accidentally related.

   “That character, though colorful, is incidental to the overall plot.”

   “incidental evidence”

2. Existing tangentially, being a byproduct, a tangent, or a likely consequence.

   “Injuries are incidental to contact sports: they're going to happen.”

3. Occurring by chance.
4. Entering or approaching, prior to reflection (more frequently incident).

noun

1. Minor items, not further defined. Incidental expense.

   “She's costing us a lot in incidentals.”

2. Something that is incidental.