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Definition of Index rerum
1. Noun. A tabulated and alphabetized notebook, for systematic preservation of items, quotations, etc. ¹
2. Noun. An index of subjects; used when a work contains multiple indexes, to differentiate from an index of personal names (index nominum), an index of places (index locorum), or an index of words (index verborum) ¹
¹ Source: wiktionary.com