Accidence

• (n.) The accidents, of inflections of words; the rudiments of grammar. • (n.) The rudiments of any subject.
Found on http://thinkexist.com/dictionary/meaning/accidence/

Accidence

Ac'ci·dence noun [ A corruption of Eng. accidents , plural of accident . See Accident , 2.] 1. The accidents, of inflections of words; the rudiments of grammar. Milton. 2. The rudiments of any subject. Lowell.
Found on http://www.encyclo.co.uk/webster/A/13

accidence

grammar book; science of inflections in grammar
Found on http://phrontistery.info/a.html
No exact match found