Noun

1. Equipment designed for a particular purpose; an apparatus.

   The laboratory included an elaborate setup for measuring the energy.

2. The fashion in which something is organized or arranged.

   The classroom setup was simple and efficient.

3. An act to frame someone; an effort or arrangement aimed at placing the blame on somebody.

   Trust me, that was a setup!

4. A computer software utility designed to install the necessary components and perform configuration necessary for a new software application. Also used as an adjective: e.g. "setup program".

   After inserting the disk, run the setup.