What is the definition of “charitable?”

Reg. l. 501(c)(3)-1(d)(2) provide that the term “charitable” is used in IRS 5Ol(c)(3) in its generally-accepted legal sense and includes relief of the poor and distressed or of the underprivileged; advancement of religion; advancement of education or science; erection or maintenance of public buildings, monuments, or works; lessening of the burdens of government; and/or promotion of social welfare.