1. A piercing or entering. 2. Mental acumen. 3. SYN: focal depth. [L. penetratio, fr. penetro, pp. -atus, to enter]

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pen·e·tra·tion .pen-ə-'trā-shən n
1) the depth to which something penetrates
2) the act or process of penetrating

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pen·e·tra·tion (pen″ə-traґshən) [L. penetratio] 1. the act of piercing or entering deeply, as by a sharp object, radiation, or a chemical or drug. 2. focal depth.

Medical dictionary. 2011.

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