- Speed is a way of measuring how quickly something is moving or being done, or something moving fast.
- An example of speed is a car being driven 45 miles per hour.
- An example of speed is someone cleaning a room in 10 minutes.
- An example of speed is how quickly a jaguar runs.
- Speed is a slang term for the street drug methamphetamine.
An example of speed is a drug that increases energy, heart rate and makes it very difficult to eat or sleep.
- Speed is defined as to help someone or something along, or move too quickly.
- An example of speed is a restaurant hostess putting regular customers at the top of a table waiting list.
- An example of speed is driving 80 mph in a 50 mph zone.
A sign shows this cars speed.
- the act or state of moving rapidly; swiftness; quick motion
- the rate of movement or motion; velocity (sense )
- the magnitude of a velocity (sense )
- the rate or rapidity of any action: reading speed
- a gear or arrangement of gears for the drive of an engine or bicycle: a truck with five forward speeds
- Informal one's kind or level of taste, capability, etc.
- ☆ Slang any of various amphetamine compounds, esp. methedrine
- Archaic luck; success; prosperity: to wish someone good speed
- the sensitivity of film to light, expressed in various numerical scales
- the widest effective aperture of a camera lens
- the length of time the shutter is opened for an exposure
Origin of speedMiddle English sped ; from Old English spæd, wealth, power, success, akin to spowan, to prosper, succeed ; from Indo-European base an unverified form spēi-, to flourish, expand from source space, spare
intransitive verbsped or speeded, speeding
- to move rapidly, esp. more rapidly than is safe or allowed by law
- to get along; fare
- to have fortune, good or bad
- to have good fortune; prosper; succeed
- to help (a project) to succeed; aid; promote
- to wish Godspeed to: to speed the parting guest
- to send, convey, or cause to move, go, etc. swiftly: to speed a letter on its way
- to cause or design (a machine, etc.) to operate at a certain speed or speeds
- Archaic to cause to succeed or prosper
up to speed
- working or operating at full speed, maximum efficiency, etc.
- Informal fully informed or having enough information
- Physics The rate or a measure of the rate of motion, especially:a. Distance traveled divided by the time of travel.b. The limit of this quotient as the time of travel becomes vanishingly small; the first derivative of distance with respect to time.c. The magnitude of a velocity.
- Swiftness of action: He wrote the first chapter with great speed.
- a. The act of moving rapidly: finished the race in a burst of speed.b. The state of being in rapid motion; rapidity: The river's speed made a rescue difficult.
- A transmission gear or set of gears in a motor vehicle: What speed is the car in now?
- a. A numerical expression of the sensitivity of a photographic film, plate, or paper to light.b. The capacity of a lens to accumulate light at an appropriate aperture.c. The length of time required or permitted for a camera shutter to open and admit light.
- Slang A stimulant drug, especially amphetamine or methamphetamine.
- Slang One that suits or appeals to a person's inclinations, skills, or character: Living in a large city is not my speed.
- Archaic Prosperity; luck.
verbsped sped or speed·ed, speed·ing, speeds
- a. To go, move, or proceed quickly: sped to the rescue.b. To drive at a speed exceeding a legal limit: was speeding on the freeway.
- To pass quickly: The days sped by. The months have sped along.
- To move, work, or happen at a faster rate; accelerate: His pulse speeded up.
- Slang To be under the influence of a stimulant drug.
- Archaic a. To prove successful; prosper.b. To get along in a specified manner; fare.
- To cause to move or proceed quickly; hasten: no wind to speed the boat.
- To increase the speed or rate of; accelerate. Often used with up: speed up a car; sped up production.
- To further, promote, or expedite (a legal action, for example).
- Archaic To help to succeed or prosper; aid.
Origin of speedMiddle English spede, from Old English spēd, success, swiftness; see spē- in Indo-European roots.