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Definition of Percentile

Percentile: The percentage of individuals in a group who have achieved a certain quantity'such as height, weight, or head circumference'or a developmental milestone. For example, the fiftieth percentile for walking well is 12 months of age.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=4830
Last Editorial Review: 3/19/2012

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