rapidity
noun
[ rəˈpɪdɪti ]
• the quality of moving or reacting with great speed.
• "the fish sank into the sand with such rapidity that it must be seen to be believed"
Similar:
quickness,
swiftness,
speed,
speediness,
briskness,
expeditiousness,
alacrity,
dispatch,
velocity,
promptness,
promptitude,
suddenness,
immediacy,
instantaneousness,
hurriedness,
haste,
hastiness,
abruptness,
precipitateness,
fleetness,
celerity,
