Webster’s Revised Unabridged Dictionary · 1913
Incidental
In′ci·den′tal (ĭn′sĭ·dĕn′tal), a. 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. Rogers.
Syn. — Accidental; casual; fortuitous; contingent; chance; collateral. See Accidental.
— In′ci·den′tal·ly, adv. — In′ci·den′tal·ness, n.
I treat either or incidentally of colors. Boyle.
In′ci·den′tal, n. 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. Pope.