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activation energy
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acuity
a·cu·i·ty [ ə ky ətee ]


noun 
Definition:
 
sharpness: keenness of hearing, sight, or intellect
[Mid-16th century. Directly or via French acuité< medieval Latin acuitas< Latin acuere (see acute)]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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