Meaning of “irony” - Learner’s Dictionary

irony

noun uk us /ˈaɪərəni/
SITUATION [ C, U ]

a situation that is strange because it is the opposite of what you expected:

The irony is that now he's retired, he's busier than ever.
HUMOUR [ U ]

a type of humour in which people say something they do not mean

(Definition of “irony” from the Cambridge Learner’s Dictionary © Cambridge University Press)