'alternationist' originates from the English word 'alternation,' which comes from the Latin word 'alternatio,' where 'alternare' meant 'to do by turns.'

'alternatio' transformed into the English word 'alternation,' and eventually became the modern English word 'alternationist.'

Initially, it meant 'to do by turns,' but over time it evolved into its current meaning of 'a person advocating for alternation.'