Celerity
WordNet
noun
(1) A rate that is rapid
WiktionaryText
Etymology
French célérité > Latin celeritas > Latin celer, fast, swift.
Noun
- Speed.
- "disposing of the parsnip wine with a celerity which might have been due to eagerness but, to Harriett, rather suggested a reluctance to let the draught linger on the palate." —Dorothy Sayers
- The speed of individual waves (as opposed to the speed of groups of waves).