Accelerator

Overview
An accelerator assists entrepreneurs in their journey toward success. An accelerator works with startups for a short and specific amount of time, usually from 90 days to four months. Accelerators also offer startups a specific amount of capital. In exchange for capital and guidance, accelerators usually require anywhere from 3 to 8 or more percent ownership of the company.

Source

 * Bill Clark, "Accelerators vs. Incubators: What’s the Difference?," MicroVentures Blog (full-text).