Anachronism
noun
1. A person or thing out of place in a historical period or sequence of events
2. A person, custom, or idea considered out of date
synonyms
misplacement, ancient, out-of-date
antonyms
current, modern, new
sentences
1. Many Amish groups of people are considered an anachronism because they use old ways like horse drawn carriages.
2. Because many things are online now, books and libraries will soon be considered an anachronism.