American Heritage Dictionary
(2)
Century Dictionary
(3)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
The global economic crisis has also affected the desire of most nurses to work abroad particularly in the US which is experiencing a retrogression, according to Arugay said.
We have moved forward in a couple of places, but in so many, many others, our retrogression has been nothing short of phenomenal.— Vanguard News
This retrogression, accounted for by the absence of soldiers who could not vote,[857] suggested trouble in New York, and to offset the influence of the Seymour rally in Brooklyn a great audience at Cooper Institute listened to a brief letter from the Secretary of State, and to a speech from Wadsworth.— A Political History of the State of New York, Volumes 1-3
E.g., an upward stroke of the pen indicated a rise of the melody, a downward stroke a fall, etc. In the course of two or three centuries these marks were added to and modified quite considerably, and the system of notation which thus grew up was called "neume notation," the word neume (sometimes spelled neuma_, or pneuma_) being of Greek origin and meaning a nod or sign This system of neumes was in some ways a retrogression from the Greek letter system, for the neumes indicated neither definite pitches nor definite tone-lengths.— Music Notation and Terminology
Therefore it is called the law of apparent retrogression, and this removes all force from the objection that socialism would be a "return to primitive barbarism_."— Socialism and Modern Science (Darwin, Spencer, Marx)

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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