[Apparently a corruption of accidents (ACCIDENT 9), Fr. accidens, transl. L. accidentia pl. neut., but perhaps a direct formation on the latter treated as a sb. fem. See quot. dated 1751.]

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  1.  That part of Grammar which treats of the Accidents or inflections of words; a book of the rudiments of grammar.

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1509.  Hawes, Past. Pleas. (1845), V. ix. 23. Dame Gramer … taught me ryght well Fyrst my Donet and then my accidence.

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1598.  Shaks., Merry Wives, IV. i. 16. I pray you aske him some questions in his Accidence.

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1612.  Brinsley, Lud. Lit. (1627), iv. 40. Let us begin with the rudiments of the Grammar, I meane the Accedence.

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1751.  Chambers, Cycl., Accidence, Accidentia, a name chiefly used for a little book, containing the first elements, or rudiments of the Latin tongue.

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1840.  De Quincey, Style, Wks. XI. 198. With two or three exceptions … we have never seen the writer … who has not sometimes violated the accidence or the syntax of English grammar.

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  2.  Hence, by extension: The rudiments or first principles of any subject.

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1562.  G. Leigh (title), The Accedence of Armorie.

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1664.  Butler, Hudibras, II. ii. 221. Their Gospel is an Accidence By which they construe Conscience.

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1870.  Lowell, Among my Books, Ser. II. (1873), 162. The poets who were just then learning the accidence of their art.

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