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significant figure

noun

🔊/ˌsɪɡnɪfɪkənt ˈfɪɡə(r)/

🔊/ˌsɪɡnɪfɪkənt ˈfɪɡjər/

(mathematics数学)

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each of the digits in a number that are needed in order to give it accurately有效数字