American Heritage Dictionary
(3)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
David Pogue doles out the fourth annual "Pogie Awards" for the best ideas in consumer electronics (no trophy, but Pogue's imprimatur is likely worth its weight in holiday sales).— Inc.com
You could probably tell just by the title and the beginning words that it's an old book (yes, the imprimatur is from 1913).— Sierra Highlands
That neither the assistance of friends nor the imprimatur of authorities is infallible is proved by the facts that mistakes do creep into works of science, however carefully examined, and that more than one book with an imprimatur has, none the less, found its way on to the Index_.— Science and Morals and Other Essays
The Congressional imprimatur was also refused to the report of the Hon. J. R. Bartlett, who was the civilian member of the Joint Commission which had established the new boundary between the United States and Mexico.— Perley's Reminiscences, v. 1-2 of Sixty Years in the National Metropolis

American Heritage Dictionary (1)
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 about twice a year.
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