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Definition of Body mass index
1. Noun. A measure of someone's weight in relation to height; to calculate one's BMI, multiply one's weight in pounds and divide that by the square of one's height in inches; overweight is a BMI greater than 25; obese is a BMI greater than 30.
Medical Definition of Body mass index
1. One of the anthropometric measures of body mass; it has the highest correlation with skinfold thickness or body density. (12 Dec 1998)