appendices definition in a report
By Richard Nordquist. Definition: A collection of supplementary materials, usually appearing at the end of a report, proposal, or book. Plural: appendixes or appendices.An appendix typically includes data and supporting documents used by the writer to develop the report. A final, optional component is an appendix. 2  Appendices allow you to include any additional information (survey resuilts, tables, figures, previous report findings, relevant letters or memos, etc.) that you have not built into your proposal's main text.