An exclamation expressing surprise, pleasure, realization, or other strong emotions.
A natural vocalization found in many languages, spelled to represent the open-mouth sound humans make when surprised or understanding something. It's not derived from any specific language root but rather captures how people naturally speak.
The word 'aah' is basically how linguists spell the sound your mouth makes when you're surprised—it's one of the few words in English that exists purely to write down a natural sound humans make, like hiccups or yawns.
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