Nouns

(n)utility, public utility, public utility company, public-service corporationa company that performs a public service; subject to government regulation
(n)utility, usefulnessthe quality of being of practical use
(n)utilitythe service (electric power or water or transportation) provided by a public utility“the cost of utilities never decreases”, “all the utilities were lost after the hurricane”
(n)utility(economics) a measure that is to be maximized in any situation involving choice
(n)utility program, utility, service program(computer science) a program designed for general support of the processes of a computer“a computer system provides utility programs to perform the tasks needed by most users”
(n)utilitya facility composed of one or more pieces of equipment connected to or part of a structure and designed to provide a service such as heat or electricity or water or sewage disposal“the price of the house included all utilities”

Adjectives

(s)utility, utility-gradeused of beef; usable but inferior
(s)utility, substitutecapable of substituting in any of several positions on a team“a utility infielder”