To discourse or write at length on a subject; to compose a dissertation.
From Latin dissertare (frequentative form of disserere: dis- 'apart' + serere 'to arrange'), meaning to discuss thoroughly by arranging ideas in sequence.
The original Latin 'dissertare' literally meant 'to arrange things apart'—and that's exactly what a good dissertation does: takes a massive pile of information and arranges it into organized, logical sections.
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