additionist

plural additionists

1. rareOne who supports or implements a policy of adding something.

   He was, he said, an "additionist"— the fellow who comes along after the historical accounts have been written and adds what's been (inadvertently or deliberately) left out.

   Jeff Riggenbach, Why American History Is Not What They Say (page 85)

   1 more example

   They were additionists in the sense that all they wanted was to add to their heritage 'pure' education from the Europeans. And their traditional cultures were supposed to remain intact and uninterfered with.

   1980, Journal of Eastern African Research and Development, page 50