Definition of "rapidity" []

• Speed, swiftness; the condition of being rapid (noun)
• A measure of velocity relative to the speed of light (noun)
• A measure of the velocity of a particle in a beam relative to the beam#s axis (noun)

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• "For most, this rapidity is a problem, or an excuse."
• "But this rapidity is not important for the final distribution."
• "I am glad to think that Canada has recovered with so much rapidity from the effects of war."