Wiktionary
n. A person who makes progress, or facilitates progress in others
Wikipedia
Progressors in science fiction are people of an advanced space-faring civilization who facilitate progress of less advanced civilizations. It comes from a perspective very much the opposite of what motivates Star Trek's famous Prime Directive.
The term progressor was coined by Boris and Arkady Strugatsky for their Noon Universe ( 1961- 1985), the term was mentioned in Hard to Be a God ( 1964), and later it (as well as a similar term regressor) was also used by Sergey Lukyanenko in the duology The Stars Are Cold Toys ( 1997), although with a somewhat different meaning. Doris Lessing explores the same themes in her Canopus in Argos series ( 1979- 1983), but she calls it forced evolution. A similar concept is the basis of Iain M. Banks' Culture series (1987–); the organization carrying out the work is named Special Circumstances. David Brin's Uplift Universe novels ( 1980- 1998) focus on the closely related phenomenon of biological uplift.
The aims of the time traveling society in Isaac Asimov's The End of Eternity, which is constantly interfering with, changing and "improving" history, are in many ways similar.
Usage examples of "progressor".
Ancar had been reviewing progressor lack of italong the border of Valdemar.
The progressor whined but responded, sending the shell lurching across the water.
The progressor shrieked again, trying to obey, but the shell slowed only a little before it slammed hard against the shore and skittered a good two meters up the rocky beach.
The progressor cut out with a final angry buzz, and Silence sat up cautiously, rubbing the worst of her bruises.