Definition: The word "achronychous" is a technical term in the field of archaeology that refers to the occurrence of artifacts or other materials produced by an ancient culture after its decline or extinction. It involves finding artifacts that are not present in any known archaeological context, such as those that have been found alongside an unidentifiable cultural artifact in modern-day contexts. The term "achronychous" is often used to describe the historical period when a particular civilization was in existence before it was replaced by another. It implies that the ancient culture produced artifacts that are no longer present today and that were not likely to have been made during its peak of activity, hence being referred to as "achronychous". The word has been historically used to describe any event or period when an ancient civilization went into decline, with no known contemporary counterpart. It is often used in the context of comparing historical periods when one civilization was active and another that vanished entirely.

achronychous