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