Antichronism refers to anything that is out of place or out of time period. Some synonyms for this word include anachronism, chronology error, temporal inconsistency, historical deviation, and historical anomaly. Anachronism is the most commonly used synonym, which means something that belongs to a different time period. Chronology error indicates a mistake in the timeline or sequence of events. Temporal inconsistency refers to a contradiction in time. Historical deviation is when something or someone deviates from historical norms. Historical anomaly refers to something that is abnormal or unusual within a historical context. All these synonyms describe something that doesn't fit in with the rest.