Defination of Anachronism
An item or person that is “out of place” in relation to a time period. One type, parachronism, occurs when an object from ages past is inserted into a future time frame. Example: In a certain short-short story, an aba- cus is used in computer programming. A second type, prochronism, occurs when an object from the present or future appears in a historical setting.
: In a novel about World War I, soldiers would listen to iPods in the trenches.