- Any activity involving installation, supplying, maintenance, or repairs. Such activities are meant to be performed by qualified personnel, and may or may not be a part of a warranty or other agreement to provide said services.
- An established or otherwise organized system which is meant to supply the needs of the public. For example, a broadcasting, telephone, satellite, or information service.
- Proper function or operation. For instance, the service life of a device.
- A level or category within multiple offerings or possibilities. For example, dial-up, cable, or DSL access to the Internet.
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