There are 2 definitions of irony in English:

irony1

Line breaks: irony
Pronunciation: /ˈʌɪrəni
 
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noun (plural ironies)

[mass noun]
1The expression of one’s meaning by using language that normally signifies the opposite, typically for humorous or emphatic effect: ‘Don’t go overboard with the gratitude,’ he rejoined with heavy irony
More example sentences
  • I suppose that there are people who could fail to notice when I'm deploying irony, exaggerating for humorous effect or just burbling.
  • They do it very quickly, using irony, saying the opposite of what they mean, and using extreme language.
  • But did he know he would use irony to such clever effect even a moment before he began doing so?
Synonyms
sarcasm, sardonicism, dryness, causticity, sharpness, acerbity, acid, bitterness, trenchancy, mordancy, cynicism; mockery, satire, ridicule, derision, scorn, sneering; wryness, backhandedness
British informal sarkiness
1.1A state of affairs or an event that seems deliberately contrary to what one expects and is often wryly amusing as a result: the irony is that I thought he could help me [count noun]: one of life’s little ironies
More example sentences
  • It would be the final irony of this extraordinary affair if the fight were to be cancelled on the grounds that it could be a threat to public order.
  • It's at this point I begin to wonder whether Wayne's post is actually satirical, replete with deliberate ironies I completely missed.
  • There's plenty of irony in seeing one monopoly accuse another monopoly of restricting users' choices.
Synonyms
paradox, paradoxical nature, incongruity, incongruousness, peculiarity
1.2 (also dramatic or tragic irony) A literary technique, originally used in Greek tragedy, by which the full significance of a character’s words or actions is clear to the audience or reader although unknown to the character.
More example sentences
  • They considered dramatic monologue, dramatic irony, persona as mask, and so on.
  • The novel's tragic irony serves to pique the conscience of the reader, as well as to spotlight Steinbeck's political concerns for the equality and happiness of all members of the human family
  • Schlegel's Romantic irony was a reaction to the systematic thought of Kant.

Origin

early 16th century (also denoting Socratic irony): via Latin from Greek eirōneia 'simulated ignorance', from eirōn 'dissembler'.

Definition of irony in:

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Word of the day anomalous
Pronunciation: əˈnämələs
adjective
deviating from what is standard, normal, or expected

There are 2 definitions of irony in English:

irony2

Line breaks: irony
Pronunciation: /ˈʌɪəni
 
/

adjective

Of or like iron: an irony grey colour

Definition of irony in: