Merriam-Webster Collegiate Dictionary - regimen

 noun  Etymology: Middle English, from Medieval Latin regimin-, ~ position of authority, direction, set of rules, from Latin, steering, control, from regere to direct  Date: 14th century  1.  a. 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 ~ of a top athlete  2. government, rule  3. regime 1c