Irony -
_A rhetorical device, in which there is an incongruity or discordance between what a speaker or writer says and what he or she means, or what is generally understood.
In modern usage it can also refer to particularly striking examples of incongruities observed in everyday life between what was intended or said and what actually happened.
There is some argument about what is or is not ironic, but all the different senses of irony revolve around the perceived notion of an incongruity between what is said and what is meant; or between an understanding of reality, or an expectation of a reality, and what actually happens.
Irony can be humorous, but it does not have to be._
i.e.