obesity

noun

obe·​si·​ty ō-ˈbē-sə-tē How to pronounce obesity (audio)
Synonyms of obesitynext
: a condition characterized by the excessive accumulation and storage of fat in the body
Obesity affects not just appearance, but disease processes as well.Malorye Allison

Examples of obesity in a Sentence

obesity has been linked to a number of health risks, such as heart disease
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.
Although some patients dislike needles, others don't seem to mind the weekly injections, obesity experts said. CBS News, 23 Dec. 2025 Where earlier obesity drugs work primarily through appetite suppression, glucagon seems to also boost metabolism by revving up the liver. Sarah Zhang, The Atlantic, 23 Dec. 2025 The Wegovy pill is FDA-approved to reduce excess body weight and maintain weight reduction long-term in adults who have obesity or are overweight. Korin Miller, SELF, 23 Dec. 2025 The pill will contain 25 mg of semaglutide—the same compound in the injectable version of Wegovy—to treat overweight or obesity, either for people who use the pills to start a weight-loss program or for those who use them to maintain weight loss. Alice Park, Time, 23 Dec. 2025 See All Example Sentences for obesity

Word History

Etymology

borrowed from Middle French & Latin; Middle French obesité, borrowed from Latin obēsitāt-, obēsitās, from obēsus "fat, stout" + -itāt-, -itās -ity — more at obese

First Known Use

circa 1611, in the meaning defined above

Time Traveler
The first known use of obesity was circa 1611

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Cite this Entry

“Obesity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/obesity. Accessed 28 Dec. 2025.

Medical Definition

obesity

noun
obe·​si·​ty ō-ˈbē-sət-ē How to pronounce obesity (audio)
plural obesities
: a condition that is characterized by excessive accumulation and storage of fat in the body and that in an adult is typically indicated by a body mass index of 30 or greater

More from Merriam-Webster on obesity

Last Updated: - Updated example sentences
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