Meaning of “speed” - Learner’s Dictionary

speed

noun uk us /spiːd/
HOW FAST [ C, U ]

B1 how fast something moves or happens:

high/low speed
He was travelling at a speed of 90 mph.
FAST MOVEMENT [ U ]

B2 very fast movement:

He put on a sudden burst of speed.

(Definition of “speed noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)