- Verb. (transitive) To connect, set up or prepare something for use.
- Verb. (transitive) To admit formally into an office, rank or position.
- Verb. (transitive) To establish or settle in.
- Noun. (informal) Installation. (Usage originated as a truncated form of the word installation.).
- Noun. (computing) (sense, jargon) A computer software utility that is run to install a software application. Also used as an adjective.