body mass index
- noun a figure obtained by dividing the weight in kilos of a person by the square of his or her height in metres.
- A measure of obesity in human beings equal to a person’s weight in kilograms divided by the square of their height in metres. If between 25 and 30, then the person is considered overweight, if over 30 they are obese. (Example weight 75 kg (168 lb), height 1.7 m (5 ft 7 in), body mass index = 75/(1.7 x 1.7) = 25.95, hence overweight).
- noun a figure obtained by dividing someone’s weight in kilos by the square of his or her height in metres. 19–25 is considered usual.