completism

noun

1. A desire to obtain a complete collection of some type of thing.

   uncountable

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

Where it comes from

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

Adapted from the Wiktionary entry completism (CC BY-SA 4.0).

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