regimen

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A regulated system, as of medication, diet, or exercise, used to promote health or treat illness or injury.
• noun A procedure, program, or routine.
• noun A systematic way of managing something.
• noun Archaic Governmental rule or control.

from The Century Dictionary.

• noun In physical geography, the physical characteristics of a river, especially of a graded river; also, the condition of a river or current when it does not actively build up or wear down its course; in general, grade. See the extract.
• noun Orderly government or system; system of order; government; control.
• noun Any regulation or remedy which is intended to produce beneficial effects by gradual operation; specifically, in medicine, the regulation of diet, exercise, etc., with a view to the preservation or restoration of health, or for the attainment of a determinate result; a course of living according to certain rules: sometimes used as equivalent to hygiene, but most commonly used as a synonym for diet, 2.
• noun In zoology, habit or mode of life with regard to eating; choice of food; dietetics: as, an animal or a vegetable regimen; carnivorous regimen.
• noun In grammar: Government; the control which one word exercises over the form of another in connection with it.
• noun The word or words so governed.

from the GNU version of the Collaborative International Dictionary of English.

• noun Orderly government; system of order; adminisration.
• noun (Med.) Any regulation or remedy which is intended to produce beneficial effects by gradual operation.
• noun A syntactical relation between words, as when one depends on another and is regulated by it in respect to case or mood; government.
• noun The word or words governed.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Orderly government; system of order; administration.
• noun Any regulation or remedy which is intended to produce beneficial effects by gradual operation.
• noun grammar A syntactical relation between words, as when one depends on another and is regulated by it in respect to case or mood; government.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (medicine) a systematic plan for therapy (often including diet)