American Heritage Dictionary
(2)
Century Dictionary
(3)
GNU Webster's 1913
WordNet
(2)
Elsewhere on the web
Crespi 2008 Psychosis and autism as diametrical disorders of the social brain— Citizendium, the Citizens' Compendium - Recent changes [en]
Psychosis and autism as diametrical disorders of the social brain Schizophrenia as one extreme of a sexually selected fitness indicator— Citizendium, the Citizens' Compendium - Recent changes [en]
As much as the signatories to the merger may deem their action healthy for the political field, the two officials, both of whom Senators from Maryland County, have different and diametrical views.— AllAfrica News: Latest
By subjecting Iceland to this unique kind of financial squeeze, Icelandic policy stands in diametrical contrast to that of the United States.— GlobalResearch.ca
If this is not diametrical opposition, i dont know what is.— Original Signal - Transmitting Digg

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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