"The English noun commonwealth in the sense meaning "public welfare; general good or advantage" dates from the 15th century. The original phrase "the common-wealth" or "the common weal" (echoed in the modern synonym "public weal") comes from the old meaning of "wealth," which is "well-being", and is itself a loose translation of the Latin res publica (republic). The term literally meant "common well-being." In the 17th century the definition of "commonwealth" expanded from its original sense of "public welfare" or "commonweal" to mean "a state in which the supreme power is vested in the people; a republic or democratic state..."
Wikipedia, Commonwealth, Etymology,
retrieved Wednesday 18 September 2013

"The term quality of life (QOL) references the general well-being of individuals and societies. The term is used in a wide range of contexts, including the fields of international development, healthcare, and politics. Quality of life should not be confused with the concept of standard of living, which is based primarily on income. Instead, standard indicators of the quality of life include not only wealth and employment but also the built environment, physical and mental health, education, recreation and leisure time, and social belonging..."
Wikipedia, Quality of Life
retrieved Wednesday 18 September 2013