American Heritage Dictionary
(2)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
They take pride in playing the songs exactly as they're written down; they're almost anti-improvisation, which is interesting.
The author is assuredly far nearer the mark in another place when he speaks of "_that immense improvisation which is the French Revolution" (ii.— Studies in Literature
They have all the spontaneity of improvisation, the seductive melody of unpremeditated music.— Sketches and Studies in Italy and Greece, First Series
Kitchener's great improvisation is already bearing fruit, and the New— Mr. Punch's History of the Great War
Although these pieces are the height of improvisation, they never lose their melodic and rhythmic sensibility.— Mininova

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 month.
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