Dictionary definition · speed
noun
- distance travelled per unit time
- a rate (usually rapid) at which something happens"the project advanced with gratifying speed"
- changing location rapidly
- the ratio of the focal length to the diameter of a (camera) lens system
- a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression
verb
- move hurridly"He rushed down the hall to receive his guests"
- move faster"The car accelerated"
- move very fast"The runner zipped past us at breakneck pace"
- travel at an excessive or illegal velocity"I got a ticket for speeding"
- cause to move faster"He accelerated the car"
Source: Open English WordNet (CC BY 4.0).