Borrowed from Latin antithesis, itself a borrowing from Ancient Greek ἀντίθεσις (antíthesis). Surface analysis: anti- + thesis.
Abraham Lincoln, Gettysburg Address (1863)
The world will little note, nor long remember what we say here, but it can never forget what they did here.
antithesis (plural antitheses)
- A proposition that is the diametric opposite of some other proposition.
- (rhetoric) A device by which two contrasting ideas are juxtaposed in parallel form.
[1835, L[arret] Langley, A Manual of the Figures of Rhetoric, […], Doncaster: Printed by C. White, Baxter-Gate, OCLC 1062248511, page 22:
Antithesis, opposing things to things,
Oft from the contrast strength and beauty brings.]
proposition that is opposite to other proposition