reg·​i·​men | \ ˈre-jə-mən How to pronounce regimen (audio) also ˈre-zhə- How to pronounce regimen (audio) \

Definition of regimen

1a : a systematic plan (as of diet, therapy, or medication) especially when designed to improve and maintain the health of a patient
b : a regular course of action and especially of strenuous training the daily regimen of athletes

Did you know?

We borrowed regimen straight from Latin, spelling and all—but in Latin, the word simply meant "rule" or "government." In English, it usually refers to a system of rules or guidelines, often for living a healthy life or taking a regular dose of exercise. The Latin regimen derives from another Latin word, the verb regere, which means "to lead straight" or "to rule." If you trace straight back from regere, you'll find that regimen has plenty of lexical kin, including correct, erect, region, rule, and surge. If you are using the training sense of regimen, be careful not to confuse the word with regiment, another regere descendant, which is used for a military unit.

Examples of regimen in a Sentence

with the start of the new year, a new party will have regimen over the nation and, hopefully, bring some much-needed change
Recent Examples on the Web The staff said Moderna’s two-dose regimen was 37% effective for 2- to 5-year-olds and 51% effective for children 6 to 23 months. Liz Essley Whyte, WSJ, 17 June 2022 Pfizer's vaccine regimen for little kids is two doses, given three weeks apart, followed by a third dose at least two months later. Berkeley Lovelace Jr., NBC News, 17 June 2022 Pfizer’s vaccine regimen is three doses at one-tenth the strength of its adult dose., 17 June 2022 The regimen for this age group is a three-dose series, with each dose containing one-tenth the amount of vaccine given to adults. Karen Kaplanscience And Medicine Editor, Los Angeles Times, 7 June 2022 While previous trials of a two-dose regime produced lackluster results, the three-dose regimen was 80 percent effective in preventing symptomatic infection. Stephanie H. Murray, The Week, 23 May 2022 The landscape is especially complicated given that the two-drug regimen has been available since the U.S. Food and Drug Administration approved it in 2000. Ed Silverman, STAT, 14 May 2022 His early morning fitness regimen is also an invaluable opportunity for Wallace to find focus for his mental health. Brett Williams, Men's Health, 22 Feb. 2022 Athletes say the testing regimen can be illogical and confusing. Laura L. Davis, USA TODAY, 7 Feb. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'regimen.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of regimen

14th century, in the meaning defined at sense 1a

History and Etymology for regimen

Middle English, from Medieval Latin regimin-, regimen position of authority, direction, set of rules, from Latin, steering, control, from regere to direct

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The first known use of regimen was in the 14th century

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Last Updated

2 Jul 2022

Cite this Entry

“Regimen.” Dictionary, Merriam-Webster, Accessed 3 Jul. 2022.

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More Definitions for regimen


reg·​i·​men | \ ˈre-jə-mən How to pronounce regimen (audio) \

Kids Definition of regimen

: a systematic course of action a daily exercise regimen


reg·​i·​men | \ ˈrej-ə-mən also ˈrezh-ə- \

Medical Definition of regimen

: a systematic plan (as of diet, therapy, or medication) especially when designed to improve and maintain the health of a patient

More from Merriam-Webster on regimen

Nglish: Translation of regimen for Spanish Speakers

Britannica English: Translation of regimen for Arabic Speakers


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