American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
It is based on the research of neuroscientist Ryuta Kawashima, who has found that certain activities stimulate the prefrontal cortex of the brain.— RNews - TOP STORIES
A significant difference in the search landscape will only come from a major disruption, one that makes users stop, think, and engage their prefrontal cortexes.

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