well·nessnoun1. the quality or state of being healthy in body and mind, especially as the result of deliberate effort.2. an approach to healthcare that emphasizes preventing illness and prolonging life, as opposed to emphasizing treating diseases.Origin: well1 (def 13) + -ness Medical Dictionarywellness well·ness (wěl’nĭs) n. The condition of good physical and mental health, especially when maintained by proper diet, exercise,and habits. as·sess·mentnoun1. the act of assessing; appraisal; evaluation.