(physics) The acceleration felt by an object, as opposed to the coordinate acceleration. For example the acceleration of an object at the surface of the Earth is 9.81 m/s² upwards, but has no coordinate acceleration. The proper acceleration of an object is Lorentz invariant.

soil erosion occurring at a rate much faster than soil horizons can be formed from the parent regolith.

(physics) A four-vector that describes the change in a particle's four-velocity over time

plural of four-acceleration

(automotive, Canada) The lost value a vehicle carries after it has been repaired from an accident.

plural of acceleration clause

(law) a provision in a contract that makes all obligations to be performed under the contract due immediately upon a specific occurrence, such as a breach

(mechanics) Motion with a continually increasing velocity.

(physics) A method for accelerating electrically charged particles with a large-amplitude electron plasma wave.

The force which causes accelerated motion.