Swiftness (8)
'swiftness' is the definition.
(celerity means swiftness)
This is all the clue.
(Other definitions for celerity that I've seen before include "Expedition" , "Swiftness of movement" , "Pace" , "showing a good turn of speed" , "Quickness" .)
'swiftness' is the definition.
(rapidity is a kind of swiftness)
This is the entire clue.
(Other definitions for rapidity that I've seen before include "haste" , "Swiftness" , "Dispatch" , "Noun meaning speed or quickness" , "Cried" .)
'swiftness' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for speed that I've seen before include "Rate of movement" , "Film sensitivity to light" , "Rate of travel" , "Rate of progress" , "Move quickly (and illegally?)" .)
'swiftness' is the definition.
(haste is a kind of swiftness)
This is all the clue.
(Other definitions for haste that I've seen before include "dispatch" , "Promptitude" , "''Marry in . . . . ., repent at leisure''" , "furious activity" , "make speed" .)