Last Updated:2025/11/20
speed, swiftness; the condition of being rapid / (physics) A measure of velocity relative to the speed of light / (physics) A measure of the velocity of a particle in a beam relative to the beam's axis
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rapidity
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Source Word
rapidity
IPA(Pronunciation)
Noun
countable
uncountable
Japanese Meaning
速さ、すなわち迅速さ;物事が素早く進む状態 / (物理学)光速に対する速度の相対的な尺度 / (物理学)ビーム内の粒子の、ビーム軸に対する速度の尺度
( plural )