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Social welfare can be taken to mean.

the welfare or well-being of a society .
in economics, the utility of people considered in aggregate. For social welfare in the economic sense, see welfare economics and social welfare function.
the provision of a wide range of social services, for the benefit of individual citizens. This usage is closely related to the idea of the welfare state.
Social welfare should be distinguished from welfare. In the United States, welfare is sometimes a synonym for the provision of financial aid in the form of social security. Social welfare may be associated with social work services.