'antepone' seems to have the advantage for the latter half of the 19th century and then around 1965 'prepone' blows it away. https://books.google.com/ngrams/gr

'antepone' seems to have the advantage for the latter half of the 19th century and then around 1965 'prepone' blows it away. https://books.google.com/ngrams/graph?content=prepone%2C+antepone&year_start=1800&year_end=2019&corpus=26&smoothing=3&direct_url=t1%3B%2Cprepone%3B%2Cc0%3B.t1%3B%2Cantepone%3B%2Cc0 https://books.google.com/ngrams/graph?content=prepone%2C+ant...