The quality or state of being aggregated or gathered together as a whole.
From 'aggregate' plus '-ness,' a suffix that converts adjectives into nouns describing abstract qualities. -ness is one of English's oldest ways to make nouns.
English speakers constantly create new abstract nouns with -ness: 'quick' → 'quickness,' 'happy' → 'happiness,' 'aggregate' → 'aggregateness,' showing how productive this ancient suffix remains.
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