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Concentration
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==Etymology== ''Concentration-'', ''concentratio'', action or an act of coming together at a single place, bringing to a common center, was used in [[Neo-Latin|post-classical Latin]] in 1550 or earlier, similar terms attested in Italian (1589), Spanish (1589), English (1606), French (1632).<ref>{{Cite OED|concentration|id=38114}}</ref>
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