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It is an interjection.

Definition:a · hainterjection

It is used as an exclamation of triumph, mockery, contempt, irony, surprise, or other emotional utterance. Note that when aha is used in a sentence, it typically appear in dialog, and then is often set apart from the sentence by an exclamation point or comma.

Example: If Archimedes had exclaimed "Aha!" rather than "Eureka!", his famous outburst might not have been so notable.

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11y ago

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