antithesis

n. opposite, contrast

This article is about the rhetorical device. For the historical issue in Dutch politics, see Antithesis (Netherlands). Antithesis (Greek for "setting opposite", from against + position) is a counter-propositions and denotes a direct contrast to the original proposition. In setting the opposite, an individual brings out of a contrast in the meaning (eg., the definition, interpretation, or semantics) by an obvious contrast in the expression.
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Noun
1. exact opposite; "his theory is the antithesis of mine"
(hypernym) opposition, oppositeness
2. the juxtaposition of contrasting words or ideas to give a feeling of balance
(hypernym) rhetorical device

(n.)
The second of two clauses forming an antithesis.
  

(n.)
Opposition; contrast.
  

(n.)
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."
  

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substitution of one letter for another