Accidence

1669, John Milton, Accedence Commenc’t Grammar (title of a Latin grammar)

1871, Review of An Elementary Greek Grammar by William W. Goodwin, North American Review, Volume 112, No. 231, 1 April, 1871, p. 427, Our best schools send every year to college boys who know their accidence reasonably, and in some cases admirably well […]

To teach Schollars how to bee able to reade well, and write true Orthography, in a short space. 2. To make them ready in all points of Accedence and Grammar, to answere any necessary question therein.

"Room. Rooms. It same thing." Jalii was above accidence.

All major sectors of English grammar, including syntax and accidence, are put through their paces in a systematic way[.]

When Franklin, playing with his kite in a thunderstorm, brought down sparks from the heavens, he was learning the accidence of that science of Electricity which has given us the Telegraph and Telephone […]

And forsomuch as this treateth of blazon of Armes, and of the worthie bearers of them […] I therefore, have named this, the Accedence of Armorie […]

Sir Hugh, my husband says my son profits nothing in the world at his book. I pray you, ask him some questions in his accidence.