speed

A rate (usually rapid) at which something happens.

“the project advanced with gratifying speed”

A central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression.

Changing location rapidly.

The ratio of the focal length to the diameter of a (camera) lens system.

Distance travelled per unit time.

Travel at an excessive or illegal velocity.

“I got a ticket for speeding”

Cause to move faster.

Move hurridly.

Move very fast.

“The runner zipped past us at breakneck speed”

Move faster.