An exclamation expressing surprise, triumph, or sudden realization.
An onomatopoetic word, meaning it imitates the sound of laughter or sudden surprise. It appears in English from at least the 16th century as a natural vocalization that became standardized in writing. The spelling varies as 'hah,' 'ha,' or 'haha' depending on intensity.
Interjections like 'hah' are one of the few words that are basically just written-down sounds—linguists call them onomatopoeia, and they're different in every language because people around the world genuinely laugh differently!
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