How to Say "aha!" in Spanish
The Spanish word for “aha!” is “ajá” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
interjectionA2
expressing realization or discovery

Examples
—Tienes que girar la perilla tres veces a la izquierda. —¡Ajá! Ya entendí por qué no abría.
—You have to turn the knob three times to the left. —Aha! Now I understand why it wouldn't open.
Ajá, con que tú fuiste quien se comió el último pastelillo.
Aha, so you were the one who ate the last cupcake.
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