accidentiality|æksɪˌdɛnʃɪˈælɪtɪ| [f. accidential + -ity.] An accidential quality. 1814Edin.Rev. XXIII. 66 We are assailed, at every step, by..accidentialities, and all the ineffable appellations.Ibid. 67 While the last six are..on account of their ‘accidentiality,’ subdivided.