A playful or informal gathering or collection of people or things, especially one that is large, miscellaneous, or somewhat haphazard.
A jocular formation from 'gather' plus the Latin suffix '-um,' created in English in the 1700s as a humorous back-formation mimicking Latin scientific terms, sometimes spelled 'gatherumption.'
Victorian writers loved inventing absurd Latin-sounding words by sticking '-um' on English words—'gatherum' is basically a joke that stuck around, showing how language can be playfully broken without breaking actual communication.
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