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
2
: government, rule
3
: regime sense 1c
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Merriam-Webster unabridged
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Time Traveler for regimen
The first known use of regimen was in the 14th century
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