A dissertation is a long piece of writing that uses research to bring to light an original idea. Don't go to grad school unless you're prepared to write, say, a 300-page dissertation on some topic.

In everyday speech, we sometimes accuse people of delivering dissertations when they overload us with dull information. If you're annoyed with a long memo from your office manager about keeping the kitchen clean, you could mutter to a coworker, “How’d you like that dissertation Felix posted about rinsing out our mugs?”

Definitions of dissertation
  1. noun
    a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree
    synonyms: thesis
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    type of:
    a formal exposition
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