Origin: Latin suffix -ence
Accidence has 2 different meanings across 1 category:
the part of grammar that deals with the inflections of words
The accidents or inflections of words; the rudiments of grammar.
The word comes from the Latin accidēns, meaning "that which happens," and originally referred to accidental matters. It entered English in the late 14th century, with its specific grammatical sense appearing by the mid-15th century.