Related to or characteristic of diplography or the process of making duplicate documents.
From 'diplograph' + '-ical' (relating to, in the manner of). This extended form emphasizes the comprehensive nature of duplicate-writing processes and systems.
Adding '-ical' to adjectives is an old English habit that makes them sound more formal—'diplographical' sounds like a 19th-century technology patent when 'diplographic' would do just fine!
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