1. the pedal in a vehicle that controls speed by increasing fuel flow to the engine
2. a device or substance that increases the rate of a process or reaction
3. a machine that increases the speed of subatomic particles for scientific research
Usage: physics

Examples

• She pressed the accelerator to merge onto the highway.
• The driver’s foot slipped off the accelerator.
• The chemical accelerator sped up the curing process.
• Scientists use the particle accelerator to study atomic structure.
• The concrete accelerator helped the foundation set faster.
• He eased off the accelerator as he approached the stop sign.