health is defined as being "a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity".
The English word "health" comes from the Old English word hale, meaning "wholeness, a being whole, sound or well,". Hale comes from the Proto-Indo-European root kailo, meaning "whole, uninjured, of good omen". Kailo comes from the Proto-Germanic root khalbas, meaning "something divided". Medilexicon's medical dictionary has three definitions for health, the first being "The state of the organism when it functions optimally without evidence of disease or abnormality"
In 1986, the WHO, in the Ottawa Charter for Health Promotion, said that health is "a resource for everyday life, not the objective of living. Health is a positive concept emphasizing social and personal resources, as well as physical capacities." Classification systems such as the WHO Family of International Classifications (WHO-FIC), which is composed of the International Classification of Functioning, Disability, and Health (ICF) and the International Classification of Diseases (ICD) also define health.
Overall health is achieved through a combination of physical, mental, emotional, and social well-being, which, together is commonly referred to as the Health Triangle.