define standard metre
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a uniform time for places in approximately the same longitude, established in a country or region by law or custom.
"it is at 8.30 standard time"
"it is at 8.30 standard time"
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The meter is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second. Note that the effect of this definition is to fix the speed of light in vacuum at exactly 299 792 458 m. · X.
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