[ an'tɪθəsɪs ]
■ noun ( plural antitheses -si:z )
1》 a person or thing that is the direct opposite of another.
↘a contrast or opposition between two things.
2》 a rhetorical or literary device in which an opposition or contrast of ideas is expressed.
3》 (in Hegelian philosophy) the negation of the thesis as the second stage in the process of dialectical reasoning. Compare with synthesis .
Origin
ME: from late L., from Gk antitithenai 'set against'.