a person or thing that takes or can take the place of another | the service (electric power or water or transportation) provided by a public utility |
someone who takes the place of another (as when things get dangerous or difficult) | a 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 |
an athlete who plays only when a starter on the team is replaced | the quality of being of practical use |
| (computer science) a program designed for general support of the processes of a computer |
| a company that performs a public service; subject to government regulation |
| (economics) a measure that is to be maximized in any situation involving choice |