Aha/ɑːˈhɑː/ Definition 1 of 3Pro Tip 1/3Express Realization Use 'aha' when you suddenly understand something that was confusing before. Aha! Now I get how this equation works. Pro Tip 2/3Show Surprise 'Aha' is perfect for showing that something is unexpectedly clear or when surprised by a discovery. Aha! So that's where I left my keys! Pro Tip 3/3Convey Satisfaction Indicate contentment at a revelation or a solution to a problem with 'aha'. Aha, that's exactly what I was hoping to hear!