definition of
speed

[1] #1 speed n. [velocity] distance travelled per unit time. wn

[2] #2 speed n. [swiftness, fastness] a rate (usually rapid) at which something happens; "the project advanced with gratifying speed". wn

[3] #3 speed v. [rush, hotfoot, hasten, hie, race, pelt along, rush along, cannonball along, bucket along, belt along, step on it] move fast; "He rushed down the hall to receive his guests"; "The cars raced down the street". wn

[4] #4 speed v. [accelerate, speed up, quicken] move faster; "The car accelerated". wn

[5] #5 speed n. [speeding, hurrying] changing location rapidly. wn