incidentalnessn.
/ˌɪnsᵻˈdɛntlnəs/, U.S. /ˌɪnsəˈdɛn(t)lnəs/ The quality or state of being incidental.In Worcester, etc.
ΚΠ
1730 N. Bailey et al. Dictionarium Britannicum Incidentalness, the quality of happening or falling out occasionally.
1775 in J. Ash New Dict. Eng. Lang.
This entry has not yet been fully updated (first published 1900; most recently modified version published online March 2022).
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n.1730