CELERITY
celerity, quickness, rapidity, rapidness, speediness
(noun) a rate that is rapid
Source: WordNet® 3.1
Etymology
Noun
celerity (usually uncountable, plural celerities)
Speed, swiftness.
(oceanography) The speed of individual waves (as opposed to the speed of groups of waves).
(hydrology) The speed with which a perturbation to the flow propagates through the flow domain.
(telecommunications, dated) The speed of symbol transmission, now called baud rate.
Source: Wiktionary
Ce*ler"i*ty, n. Etym: [L. celeritas, from celer swiftm speedy: sf. F.
célérité.]
Definition: Rapidity of motion; quickness; swiftness.
Time, with all its celerity, moves slowly to him whose whole
employment is to watch its flight. Johnson.
Source: Webster’s Unabridged Dictionary 1913 Edition