speed

noun
\ ˈspēd How to pronounce speed (audio) \

Definition of speed

 (Entry 1 of 2)

1 archaic : prosperity in an undertaking : success
2a : the act or state of moving swiftly : swiftness
b : rate of motion: such as
(2) : the magnitude of a velocity irrespective of direction
c : impetus
3 : swiftness or rate of performance or action : velocity sense 3a
4a : the sensitivity of a photographic film, plate, or paper expressed numerically
b : the light-gathering power of a lens or optical system
c : the time during which a camera shutter is open
5 : a transmission gear in automotive vehicles or bicycles usually used in combination a ten-speed bicycle
6 : someone or something that appeals to one's taste just my speed
7 : methamphetamine also : a related stimulant drug and especially an amphetamine
at speed
chiefly British
up to speed
: operating at full effectiveness or potential

speed

verb
sped\ ˈsped How to pronounce sped (audio) \ or speeded; speeding

Definition of speed (Entry 2 of 2)

intransitive verb

1a archaic : to prosper in an undertaking
b archaic : get along, fare
2a : to make haste sped to her bedside
b : to go or drive at excessive or illegal speed
3 : to move, work, or take place faster : accelerate the heart speeds up

transitive verb

1a archaic : to cause or help to prosper : aid
b : to further the success of
2a : to cause to move quickly : hasten
b : to wish Godspeed to
c : to increase the speed of : accelerate
3 : to send out speed an arrow

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Other Words from speed

Noun

speedster \ ˈspēd-​stər How to pronounce speedster (audio) \ noun

Verb

speeder noun