To establish or settle in.
To connect, set up or prepare something for use, often specifically (in Computing) to transfer software onto a device's permanent storage and put it in a state where it is ready to be run when needed, usually decompressing it if necessary and performing any necessary pre-first-run configuration.
To admit formally into an office, rank or position.
An installation. (Usage originated as a truncated form of the word installation.)
Installer. A software utility that installs an application.
To agree to purchase some good or service.
To add one's own name to the list of people who are participating in something (including amateur, but not professional, teams)
To add a name to the list of people who are participating in something.