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According to Wikipedia:
"Health is the level of functional or metabolic efficiency of a living being. In humans, it is the general condition of a person's mind, body and spirit, usually meaning to be free from illness, injury or pain (as in “good health” or “healthy”). The World Health Organization (WHO) defined health in its broader sense in 1946 as "a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity." Although this definition has been subject to controversy, in particular as having a lack of operational value and the problem created by use of the word "complete", it remains the most enduring."
The freedictionary has it as:
adj. health·i·er, health·i·est
1. Possessing good health.
2. Conducive to good health; healthful: healthy air.
3. Indicative of sound, rational thinking or frame of mind: a healthy attitude.
4. Sizable; considerable: a healthy portion of potatoes; a healthy raise in salary.
Skeat's Etymological Dictionary has it coming from the Anglo-Saxon and earlier terms which meant "whole". Which is confirmed by the Online Etymology Dictionary as :
O.E. hælþ "wholeness, a being whole, sound or well," from P.Gmc. *hailitho, from PIE *kailo- "whole, uninjured, of good omen" (cf. O.E. hal "hale, whole;" O.N. heill "healthy;" O.E. halig, O.N. helge "holy, sacred;" O.E. hælan "to heal"). Of physical health in M.E., but also "prosperity, happiness, welfare; preservation, safety."