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rapidity
noun
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How to pronounce rapidity:

Definition of rapidity:

rapidity (noun):
speed or eagerness
a rate that is rapid.
the quality or state of being rapid

Synonyms for rapidity:

promptnessvelocityexpeditionalacritydispatchhastespeedrushpacehurry
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Other 4-syllable words like rapidity

Here are some other common words that have 4 syllables, like rapidity does.

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