Definition of "Speed" :

noun: changing location rapidly

noun: a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression

noun: a rate (usually rapid) at which something happens

"The project advanced with gratifying speed."

noun: the ratio of the focal length to the diameter of a (camera) lens system

noun: distance travelled per unit time

verb: move faster

verb: cause to move faster

verb: move very fast

"The runner zipped past us at breakneck speed."

verb: travel at an excessive or illegal velocity

"I got a ticket for speeding."

verb: move hurridly