The Collaborative International Dictionary
Incidentalness
Incidental \In`ci*den"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.
Wiktionary
incidentalness
n. Quality of being incidental.