completism en · NOUN
Etymology
From complete + -ism. Originally from fanspeak, the slang of science fiction fans.
Meanings
-
(uncountable) A desire to obtain a complete collection of some type of thing.
Caruso's records are such an important body of material that this is one case where "completism" is justified.
1992, Fanfare, volume 15, number 5, page 294:Completism is a form of lunacy not without honor.
1986, Teresa Nielsen Hayden, “Over Rough Terrain”, in Making Book, published 1994, →ISBN, page 82:A novel type of completism is Rothman's record and determination of attending every major convention held in this country.
1944, John Bristol Speer, Fancyclopedia, Completist: