completism

Etymology

complete +‎ -ism. Originally from fanspeak, the slang of science fiction fans.

Noun

completism (uncountable)

1. A desire to obtain a complete collection of some type of thing.
   • 1944, Speer, John Bristol, Fancyclopedia‎, Completist:

     A novel type of completism is Rothman's record and determination of attending every major convention held in this country.

   • 1986, Hayden, Teresa Nielsen, “Over Rough Terrain”, in Making Book, published 1994, →ISBN, page 82:

     Completism is a form of lunacy not without honor.

   • 1992, Fanfare, volume 15, number 5, page 294:

     Caruso's records are such an important body of material that this is one case where "completism" is justified.

References

• “completism” in Jeff Prucher, editor, Brave New Words: The Oxford Dictionary of Science Fiction, Oxford; New York, N.Y.: Oxford University Press, 2007, →ISBN, page 25.
• completism n. at the OED Science Fiction Citations Project