THE'SIS, noun [Latin thesis; Gr. a position, to set.] 1. A position or proposition which a person advances and offers to maintain, or which is actually maintained by argument; a theme; a subject. 2. In logic, every proposition may be divided into thesis and hypothesis. thesis contains the thing affirmed or denied, and hypothesis the conditions of the affirmation or negation.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI