Loosely associated; of limited relevance except indirectly; only accidentally related.
That character, though colorful, is incidental to the overall plot.
Existing tangentially, being a byproduct, a tangent, or a likely consequence.
Injuries are incidental to contact sports: they're going to happen.
Occurring by chance.
Minor items, not further defined. Incidental expense.
She's costing us a lot in incidentals.
Something that is incidental.
From incident + -al.
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