American Heritage Dictionary
(1)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Perhaps it's more accurate to say walls -- concentric walls.— Window Into Palestine
Some of these represent concentric (hierarchically nested) structures, while other are partly overlapping sectors.— CiteULike: Everyone's library
In many instances this has encouraged a shift away from 'concentric' or— open source theology - Comments

American Heritage Dictionary (1)
Century Dictionary (1)
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