noun

• One who, or that which, accelerates.
• A device for causing acceleration.
• (chemistry) A substance which speeds up chemical reactions.
• (vehicles) A pedal causing the vehicle to accelerate when it is pressed.
• (photography) A chemical that reduces development time.
• (physics) A device that accelerates charged subatomic particles; a particle accelerator.
• (physiology, medicine) A muscle or nerve that speeds the performance of an action.
• (computing) An accelerator key.
• (computing) A computer component using dedicated hardware to accelerate the processing and display of graphics.
• (historical) A light van to take mails between a post office and a railway station.
• (business) A mentoring program for startup companies.