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  1. Oxford American Dictionary

    rapidity

    • IPA[rəˈpidədē]

    美式

    • n.
      the quality of moving or reacting with great speed；the fact of happening at a great rate; swiftness

    • noun: rapidity

    • 釋義

    名詞

    • 1. the quality of moving or reacting with great speed the fish sink into the sand with such rapidity that it must be seen to be believed
    • ▪ the fact of happening at a great rate; swiftness technology spreads with extraordinary rapidity