1
2
: swiftness or rate of performance or action : velocity sense 3a
3
a
: the sensitivity of a photographic film, plate, or paper expressed numerically
b
: the time during which a camera shutter is open
c
: the light-gathering power of a lens or optical system
4
: a transmission gear in automotive vehicles or bicycles
—usually used in combination
a ten-speed bicycle
5
: someone or something that appeals to one's taste
just my speed
6
: methamphetamine
also
: a related stimulant drug and especially an amphetamine
7
archaic
: prosperity in an undertaking : success
sped
ˈsped
or speeded; speeding
1
a
: to make haste
sped to her bedside
b
: to go or drive at excessive or illegal speed
2
: to move, work, or take place faster : accelerate
the heart speeds up
1
a
: to cause to move quickly : hasten
b
: to increase the speed of : accelerate
c
: to wish Godspeed to
2
a
: to further the success of
b
archaic
: to cause or help to prosper : aid
3
: to send out
speed an arrow
speeder
noun
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Merriam-Webster unabridged
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