American Heritage Dictionary
(4)
Century Dictionary
(5)
GNU Webster's 1913
(2)
WordNet
(4)
Elsewhere on the web
Identify the type of each sentence (declarative, interrogative, imperative, exclamatory) Identify the structure of each sentence (simple, compound, compound-complex, fragment, run-on).— Recently Uploaded Slideshows
The former tends to be smug, conservative, hierarchical, even oligarchic in its propensity, while the latter tends to be progressive, dissidential, interrogative, and horizontal-democratic in its inclination.— Vanguard News
Wikipedia describes it well: "a nonstandard English-language punctuation mark intended to combine the functions of the question mark (also called the interrogative point) and the exclamation mark or exclamation point (known in printers 'jargon as the bang)".— Daring Fireball
In the Cold War, the C.I.A. used coercive interrogative techniques including physical and psych ops to discover information.— Booker Rising
When he did speak, it was in the interrogative, and he pastured his intellect on our high-class Magazines LINCOLN B. discovered many things, and noted them down for his work on Social Dry Rot in Europe_, but one matter puzzled him.— Punch, or the London Charivari, Volume 104, January 14, 1893

Century Dictionary (1)
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 several times a year.
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