Etymology
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thesis (n.)

late 14c., "unaccented syllable or note," from Latin thesis "unaccented syllable in poetry," later (and more correctly) "stressed part of a metrical foot," from Greek thesis "a proposition," also "downbeat" (in music), originally "a setting down, a placing, an arranging; position, situation," from reduplicated form of PIE root *dhe- "to set, put." Sense in logic of "a formulation in advance of a proposition to be proved" is first recorded 1570s; that of "dissertation presented by a candidate for a university degree" is from 1650s.

updated on April 30, 2017

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Definitions of thesis from WordNet

thesis (n.)
an unproved statement put forward as a premise in an argument;
thesis (n.)
a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree;
Synonyms: dissertation
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.