Définitions
1.AdjectiveLoosely associated; of limited relevance except indirectly; only accidentally related."That character, though colorful, is incidental to the overall plot.; incidental evidence"
2.AdjectiveExisting tangentially, being a byproduct, a tangent, or a likely consequence."Injuries are incidental to contact sports: they're going to happen."
3.AdjectiveOccurring by chance.
4.AdjectiveEntering or approaching, prior to reflection (more frequently incident).
5.NounMinor items, not further defined. Incidental expense."She's costing us a lot in incidentals."
6.NounSomething that is incidental.