Coincidental vs. Incidental

Coincidental and Incidental Definitions
Coincidental
Occurring as or resulting from coincidence.
Incidental
Occurring or likely to occur as an unpredictable or minor consequence
"the principle that even annoying, intrusive, and offensive speech is to be protected by the courts and tolerated by the public as incidental to an open society" (Frederick Schauer).
Coincidental
Happening or existing at the same time.
Incidental
Of a minor, casual, or subordinate nature
Incidental expenses.
Coincidental
Occurring as or resulting from coincidence.
Incidental
A minor accompanying item or expense
A pocket in the suitcase for incidentals.
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Coincidental
Happening or existing at the same time.
Incidental
Loosely associated; of limited relevance except indirectly; only accident related.
That character, though colorful, is incidental to the overall plot.
Incidental evidence
Coincidental
Coincident.
Incidental
Existing tangentially, being a byproduct, a tangent, or a likely consequence.
Injuries are incidental to contact sports: they're going to happen.
Coincidental
Occurring or operating at the same time;
A series of coincident events
Incidental
Occurring by chance.
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Incidental
Entering or approaching, prior to reflection (more frequently incident).
Incidental
Minor items, not further defined. Incidental expense.
She's costing us a lot in incidentals.
Incidental
Something that is incidental.
Incidental
Happening, as an occasional event, without regularity; coming without design; casual; accidental; hence, not of prime concern; subordinate; collateral; as, an incidental conversation; an incidental occurrence; incidental expenses.
By some, religious duties . . . appear to be regarded . . . as an incidental business.
I treat either or incidentally of colors.
Incidental
An incident; that which is incidental; esp., in the plural, an aggregate of subordinate or incidental items not particularized; as, the expense of tuition and incidentals.
Incidental
(frequently plural) an expense not budgeted or not specified;
He requested reimbursement of $7 for incidental expenses
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Incidental
An item that is incidental
Incidental
(sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence;
Incidental expenses
The road will bring other incidental advantages
Extra duties incidental to the job
Labor problems incidental to a rapid expansion
Confusion incidental to a quick change
Incidental
Following as a consequence;
An excessive growth of bureaucracy, with related problems
Snags incidental to the changeover in management
Incidental
Not of prime or central importance;
Nonessential to the integral meanings of poetry