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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The results held even after the researchers controlled for body mass index, suggesting that the difference in cognitive function was related to the types of food being eaten (fat and sugar) and not to body weight. Avery Hurt, Discover Magazine, 16 May 2025 Even some medical experts say the definition of obesity − a person who has a body mass index of 30 or more − needs to change. Ken Alltucker, USA Today, 15 May 2025 In 2020, his body mass index was just over the threshold for obesity. David Kessler, The Atlantic, 13 May 2025 Participants had a body mass index of 25 or higher (which is considered overweight) and knee pain for six months. Tom Gavin, EverydayHealth.com, 29 Apr. 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 4 Jun. 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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