Irony (from the Ancient Greek εἰρωνεία eirōneía, meaning hypocrisy, deception, or feigned ignorance) is a situation, literary or rhetorical device, in which there is an incongruity, discordance or unintended connection that goes beyond the most evident meaning.

Definitions

Henry Watson Fowler, in The King's English, says “any definition of irony—though hundreds might be given, and very few of them would be accepted—must include this, that the surface meaning and the underlying meaning of what is said are not the same."

The word 'ironic' is sometimes used as a synonym for incongruous or coincidental in situations where there is no “double audience”, and no contradiction between the ostensible and true meaning of the words. An example of such usage:

Ironically, Sir Arthur Sullivan is remembered for the comic operas he found embarrassing, rather than the serious works he hoped would be his legacy.

The American Heritage Dictionary's secondary meaning for irony: “incongruity between what might be expected and what actually occurs.” This sense, however, is not synonymous with "incongruous" but merely a definition of dramatic or situational irony. The American Heritage Dictionary’s usage panel found it unacceptable to use the word ironic to describe mere unfortunate coincidences or surprising disappointments that “suggest no particular lessons about human vanity or folly.”