/ əˈnækrənɪzəm; NAmE / noun
1.
a person, a custom or an idea that seems old-fashioned and does not belong to the present :
The monarchy is seen by many people as an anachronism in the modern world.
2.
something that is placed, for example in a book or play, in the wrong period of history
► ana·chron·is·tic / əˌnækrəˈnɪstɪk; NAmE / adjective
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WORD ORIGIN
mid 17th cent.: from Greek anakhronismos , from ana- backwards + khronos time.