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| speed [ speed ] |
noun (plural speeds) |
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| Definition: |
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1. rate of movement or happening: the rate at which something moves, happens, or functions
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2. rapidity: fast movement, progress, or operation
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3. rate of movement irrespective of direction: rate of movement irrespective of direction. It is equal either to distance traveled divided by travel time, or to rate of change of distance with respect to time.
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4. drugs
(
slang
)
Same as amphetamine
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5. mechanical engineering gear ratio: a gear ratio in a motor, engine, or driving mechanism
  a ten-speed bicycle
operates at three different speeds
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6. photog photographic film's sensitivity to light: a measure of the sensitivity of photographic film to light, expressed numerically according to any of various rating systems
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7. success: success or prosperity
(
archaic
)
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verb (past and past participle sped [ sped ] or speed·ed, present participle speed·ing, 3rd person present singular speeds) |
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| Definition: |
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1. transitive and intransitive verb go or move quickly: to go or move quickly, or make somebody or something do this
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2. intransitive verb drive fast: to drive fast, especially in excess of the speed limit
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3. intransitive verb happen quickly: to pass or happen quickly or more quickly
days speeding by
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4. intransitive verb drugs use amphetamines: to be under the influence of amphetamines
(
slang
)
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5. transitive and intransitive verb make or be prosperous: to prosper, or cause somebody or something to prosper
(
archaic
)
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| [ Old English spēd "success, prosperity" < Indo-European, "prosper"] |
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at speed quickly
overtaken by a car driving at speed
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be or get up to speed
1. to reach the maximum or desirable rate of movement or progress
2. to be or become fully informed about the latest developments
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