Speed Definition

spēd
sped, speeded, speeding, speeds
noun
speeds

The rate of movement or motion; velocity.

Webster's New World
The act or state of moving rapidly; swiftness; quick motion.
Webster's New World
The rate or rapidity of any action.
Reading speed.
Webster's New World
The state of being in rapid motion; rapidity.
The river's speed made a rescue difficult.
American Heritage

The magnitude of a velocity.

Webster's New World
Antonyms:
verb
sped, speeded, speeding, speeds
To move rapidly, esp. more rapidly than is safe or allowed by law.
Webster's New World
To go, move, or proceed quickly.
Sped to the rescue.
American Heritage
To drive at a speed exceeding a legal limit.
Was speeding on the freeway.
American Heritage
To wish Godspeed to.
To speed the parting guest.
Webster's New World
To pass quickly.
The days sped by. The months have sped along.
American Heritage
Synonyms:
adjective
Of or having to do with speed.
Webster's New World
pronoun

A surname​.

Wiktionary
idiom
up to speed
  • Fully informed; conversant:

    I'm not up to speed on these issues yet.

American Heritage
at speed
  • quickly; rapidly
Webster's New World
speed up
  • to increase in speed; go or make go faster; accelerate
Webster's New World
up to speed
  • working or operating at full speed, maximum efficiency, etc.
  • fully informed or having enough information
Webster's New World

Other Word Forms of Speed

Noun

Singular:
speed
Plural:
speeds

Idioms, Phrasal Verbs Related to Speed

Origin of Speed

  • Middle English spede from Old English spēd success, swiftness spē- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • Middle English sped (“good fortune”).

    From Wiktionary

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