(rhetoric) A figure of speech in which two words or phrases with opposing meanings are used together intentionally for effect. / (loosely, sometimes proscribed) A contradiction in terms.

plural of oxymoron

Of or pertaining to an oxymoron.

In an oxymoronic manner. / With regard to, or using oxymorons.

(nonce word, rare) The state, quality or measure of being oxymoronic.

The quality of being oxymoronic.