dissertation

Etymology

It is borrowed from Latin dissertātiō (“discourse, disquisition”),^[2][3][4] which Etymonline places in Late Latin,^[5] a noun of action from dissertō (“to debate, argue, examine”),^[2][5][4] the frequentative of disserō (“to discuss, examine”).^[3][5][6][7] That verb is formed from dis- (“apart”) and serō (“to join together, put in a row, arrange words”),^[5][3][6] from Proto-Indo-European *ser- (“to line up”).^[5] Barnhart relates it to series.^[3]

Earliest recorded meaning

Discussion or debate: 1611, in Speed's history of Great Britain;^[2][3] Etymonline dates it to the 1610s.^[5] This sense is obsolete, last recorded in 1709.^[2][4]

Semantic evolution

From 1651, in the title of Hobbes's Philosophicall Rudiments, the word was used for a spoken or written discourse treating a subject at length, a treatise or the like.^[2][3][5] Johnson (1755) defined it as "a discourse; a disquisition; a treatise".^[8] The academic sense, an extended scholarly essay based on original research and submitted for a degree, is recorded in the OED from 1873, in a catalogue of Columbia College in New York;^[2] Etymonline finds it by 1877 for continental universities and in American use by 1890.^[5] The adjective dissertational is recorded from the mid 19th century.^[4]

Timeline

• 1611 – discussion, debate (obsolete by 1709).^[2][3]
• 1651 – a discourse or treatise in which a subject is discussed at length.^[2][3][5]
• 1755 – Johnson defines it as a discourse, disquisition or treatise.^[8]
• mid 19th century – the adjective dissertational.^[4]
• 1873 – a scholarly essay based on original research, submitted for a degree.^[2]

Modern meaning

Noun

1. A long piece of writing based on original research, submitted by a candidate for a university degree, especially a doctorate; a thesis: She spent three years on her dissertation about medieval trade.
2. A long, formal spoken or written discourse on a subject; a treatise.
3. (obsolete) Discussion, debate.

Word family

• dissertational
• dissertationist

Related words

• dissertate
• series
• insert
• assert
• exert

Usage notes

English has no common verb to go with the noun: dissert, from the 1620s, borrowed from French disserter, is obsolete, and dissertate, from 1766, is marked unusual by the OED.^[5]

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e f g h Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
4. ^ a b c d e Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
5. ^ a b c d e f g h i j Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
6. ^ a b Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
7. ^ Skeat, Walter W. (1911), A Concise Etymological Dictionary of the English Language, new ed., Oxford: Clarendon Press
8. ^ a b Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.