I. noun 1. a thing belonging or appropriate to a period other than that in which it exists, especially a thing that is conspicuously old-fashioned • the town is a throwback to medieval times, an anachronism that has survived the passing years.
2. [ mass noun] — the action of attributing something to a period to which it does not belong. • it is anachronism to suppose that the official morality of the age was mere window dressing.
– origin mid 17th cent.: from Greek anakhronismos, from ana- ‘backwards’ + khronos ‘time’.