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Definition of Percentile

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

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.

Reviewed on 12/27/2018

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