What does "speediness" mean?

The property of being fast; swiftness.

What is a synonym for "speediness"?

Common synonyms include: celerity, rapidity, agility, air speed, alacrity, briskness.

/ˈspiːdinəs/ noun

noun ·Uncommon ·Advanced level

Noun

From Middle English spedines, from Old English spēdiġnes (“opulence, wealth”), equivalent to speedy + -ness.