The Merriam Webster definition is " incongruity between the actual result of a sequence of events and the normal or expected result".

That seams weak. If I make a souffle and it collapses, that would fit the definition, but it wouldn't be ironic. For something to be ironic a moral, pretentious or humorous element must be involved.

I just saw something deliciously ironic on YouTube. A line of cars was stopped on a multi-lane road, and a motorcyclist decided to get cute and drive on a long, thin island (median strip) to get around the blockage. He drove to the end of the island, stopped because he didn't want to drop off it, and found himself next to a stopped police car. Nya nya nya nya na