Sense of “formal, written treatise” is 1650s. Words We Get Wrong: How Many of These Can You Meaning dissertation? Also found in: Thesaurus, Medical, Legal, Encyclopedia, Wikipedia. He is currently writing a dissertation.
A formal, lengthy exposition of a topic:discourse, disquisition, treatise. A thorough, written presentation of an original point of view:thesis. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, or visit the webmaster’s page for free fun content.