Meaning

• Minor items, not further defined. Incidental expense.

  "She's costing us a lot in incidentals."

• Something that is incidental.

Meaning

• Loosely associated; existing as a byproduct, tangent, or accident; being a likely consequence.

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

• Occurring by chance

• (of radiation) Entering or approaching, prior to reflection (more frequently incident).