body mass index

noun

: a measure of body fat that is the ratio of the weight of the body in kilograms to the square of its height in meters

Examples of body mass index in a Sentence

A person with a body mass index of more than 30 is considered to be obese.
Recent Examples on the Web
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One recent study found that coconut oil may help manage body weight, fat mass, and body mass index (BMI). Sherri Gordon, Health, 27 Aug. 2025 Researchers found that the group who added cumin to their yogurt reduced weight, body mass index (BMI), and waist circumference. Barbie Cervoni, Verywell Health, 26 Aug. 2025 The participants were mostly women, with a mean age of 43, and all had a body mass index categorized as overweight or obesity. Beth Mole, ArsTechnica, 5 Aug. 2025 People who perceived weight discrimination were more likely to understand themselves as very overweight than people who, according to their body weight and height, were in the same body mass index range. Laura Clawson, JSTOR Daily, 5 Aug. 2025 See All Example Sentences for body mass index

Word History

First Known Use

1983, in the meaning defined above

Time Traveler
The first known use of body mass index was in 1983

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Cite this Entry

“Body mass index.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/body%20mass%20index. Accessed 6 Sep. 2025.

Kids Definition

body mass index

noun
: a measure of body fat that is the ratio of the weight of the body in kilograms to the square of its height in meters

Medical Definition

body mass index

noun
: a measure of body fat that is the ratio of the weight of the body in kilograms to the square of its height in meters
a body mass index in adults of 25 to 29.9 is considered an indication of overweight, and 30 or more an indication of obesity
abbreviation BMI

called also Quetelet index

More from Merriam-Webster on body mass index

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