The Collaborative International Dictionary
Parachronism
Parachronism \Pa*rach"ro*nism\ (p[.a]*r[a^]k"r[-o]*n[i^]z'm), n. An error in chronology, by which the date of an event is set later than the time of its occurrence. [R.]
Wiktionary
parachronism
n. An error in chronological order in which one is ascribed a later time; metachronism.