anachronism
definition
something that is out of its proper time period
example
The knight riding a motorbike in the film was a glaring anachronism that took viewers out of the historical setting.
synonyms
chronological misplacementtemporal inconsistencyout-of-date item
word origin — from Greek 'anachronismos', from 'ana-' meaning 'against' + 'chronos' meaning 'time'