American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
Yeah, no, really, this was like aah -- why didn't I remember this?— Adam Savage's obsessions
Aah, aah, aah.— Einstein the Parrot talks and squawks

Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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