English
additionist
From addition + -ist.
Formed from addition + -ist
Proto-Indo-European *deh₃- ‘to give’
Latin addō ‘add’
Latin additiō
Old French adition
Middle English addicioun
English addition
Today it means
noun One who supports or implements a policy of adding something.
Language periods are conventional ranges, not dates for this word.
Etymograph / additionist