An·tith·e·sis n.; pl. Antitheses.
1. Rhet. An opposition or contrast of words or sentiments occurring in the same sentence; as, “The prodigal robs his heir; the miser robs himself.” “He had covertly shot at Cromwell; he how openly aimed at the Queen.”
2. The second of two clauses forming an antithesis.
3. Opposition; contrast.
n 1: exact opposite; "his theory is the antithesis of mine"
2: the juxtaposition of contrasting words or ideas to give a
feeling of balance
[also: antitheses (pl)]