celerity

Pronunciation: /sɪˈlɛɹɪti/

The English word “celerity” has 4 meanings listed here.

noun

Speed, swiftness.
The speed of an individual wave (as opposed to the speed of groups of waves); often denoted c.
The speed with which a perturbation to the flow propagates through the flow domain.
The speed of symbol transmission, now called baud rate.

From Old French celeritee (compare French célérité), from Latin celeritas, from celer (“fast, swift”).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.