speed meaning
EN
[spiːd] [-iːd] 
US WSpeed
- In everyday use and in kinematics, the speed of an object is the magnitude of its velocity (the rate of change of its position); it is thus a scalar quantity.
- Like velocity, speed has the dimensions of a length divided by a time; the SI unit of speed is the metre per second, but the most common unit of speed in everyday usage is the kilometre per hour or, in the US and the UK, miles per hour.
- The fastest possible speed at which energy or information can travel, according to special relativity,
FR speed 
- NounPLspeeds
- The state of moving quickly or the capacity for rapid motion; rapidity.
- How does Usain Bolt run at that speed?
- The rate of motion or action, specifically (mathematics)/(physics) the magnitude of the velocity; the rate distance is traversed in a given time.
- (photography) The sensitivity to light of film, plates or sensor.
- (photography) The duration of exposure, the time during which a camera shutter is open.
- (photography) The largest size of the lens opening at which a lens can be used.
- (photography) The ratio of the focal length to the diameter of a photographic objective.
- SLA NU Any amphetamine drug used as a stimulant, especially illegally, especially methamphetamine.
- (archaic) Luck, success, prosperity.
- The state of moving quickly or the capacity for rapid motion; rapidity.
- VerbSGspeedsPRspeedingPT, PPspedPT, PPspeeded
- VI (archaic) To succeed; to prosper, be lucky.
- VT (archaic) To help someone, to give them fortune; to aid or favour.
- God speed, until we meet again.
- VI To go fast.
- The Ferrari was speeding along the road.
- VI To exceed the speed limit.
- Why do you speed when the road is so icy?
- VT To increase the rate at which something occurs.
- VI SLA To be under the influence of stimulant drugs, especially amphetamines.
- OBS To be expedient.
- (archaic) To hurry to destruction; to put an end to; to ruin.
- (archaic) To wish success or good fortune to, in any undertaking, especially in setting out upon a journey.
- To cause to make haste; to dispatch with celerity; to drive at full speed; hence, to hasten; to hurry.
- To hasten to a conclusion; to expedite.
- VI (archaic) To succeed; to prosper, be lucky.
- More Examples
- Used in the Middle of Sentence
- Such a progressive shift to prefrontally mediated executive processes may account for the increasing link between processing speed and myelin in anterior regions with advancing age.
- As the police approached, the car pulled off and sped away into the distance.
- Experiments in the macaque show that eye movement speed can be >20% higher when the target is rewarded compared with nonrewarded (Bendiksby and Platt 2006).
- Used in the Ending of Sentence
- I bet the Jayhawk fast break could show up the Nimrod's lack of speed.
- Defeat 12 months ago away to the same opponents signalled the end of John Toshack's reign as Wales manager, ushering in first caretaker Brian Flynn and then current boss Gary Speed.
- For example, the vehicle starts off in second gear or an upshift takes place at lower engine speeds.
- Used in the Middle of Sentence
Definition of speed in English Dictionary
- Part-of-Speech Hierarchy
- Nouns
- Countable nouns
- Singularia tantum
- Uncountable nouns
- Uncountable nouns
- Countable nouns
- Verbs
- Intransitive verbs
- Transitive verbs
- Intransitive verbs
- Nouns
Source: Wiktionary
Grammatically, this word "speed" is a noun, more specifically, a countable noun and a singularia tantum. It's also a verb, more specifically, an intransitive verb and a transitive verb.