speed Definition

speed
noun

1. Rate of movement or action, especially distance travelled per unit of time.

Thesaurus: acceleration, tempo, velocity.
2. Quickness; rapidity.

Example: with speed
Thesaurus: haste, hurry, rapidity, alacrity, promptness, velocity; Antonym: slowness, tardiness.
3. A gear setting on a vehicle.

Example: five-speed gearbox
4. A photographic film's sensitivity to light.
5. drug-taking slang
An amphetamine.

verb, intr

sped, speeding
1. To move quickly.

Thesaurus: hasten, quicken, hurry, rush, hurtle, race, sprint; Antonym: delay.
speeded, speeding
2. To drive at a speed higher than the legal limit.

Derivative: speeder

Idiom: at speed

Quickly.

Etymology: Anglo-Saxon sped.

Phrasal Verb: speed up or speed something up

To increase in speed or make it increase in speed.