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Webster's New World College Dictionary » dissertation
dissertation
dissertation definition
dis·ser·ta·tion (dis′ər tā′s̸hən)
noun
a formal and lengthy discourse or treatise on some subject, esp. one based on original research and written in partial fulfillment of requirements for a doctorate
Etymology: LL dissertatio < L dissertare, to discuss, argue, freq. of disserere < dis-, apart + serere, to join: see series
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