American Heritage Dictionary
(5)
Century Dictionary
(8)
GNU Webster's 1913
(1)
WordNet
(4)
Elsewhere on the web
It is an intestinal concretion, which fails to pass along the alimentary canal.— BioMed Central - Latest articles
But there was a lack of concretion, and that was weak.— EcoEarth.Info Environment RSS Newsfeed
Earthy matter is deposited, which becomes entangled in the mucus, and thus a concretion or stone is produced, occasioning much suffering, and perhaps death We saw, not long since, a case of this kind.— Plain Facts for Old and Young
A vegetable secretion and concretion is thus produced on oak-leaves by the gall-insect, and by the cynips in the bedeguar of the rose; and by the young grasshopper on many plants, by which the animal surrounds itself with froth.— Zoonomia, Vol. I Or, the Laws of Organic Life
If this plan reaches concretion (se verifica) he will be going abroad shortly, when he will find that his agents will be taking already the preliminary steps 4.— Pitman's Commercial Spanish Grammar (2nd ed.)

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 once a year.
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