"milliarcsecond" meaning in English

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        "(metrology) A unit of angle equal to one thousandth of an arcsecond (used especially in astronomy)"
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  "etymology_text": "Etymology tree\nProto-Indo-European *sem-\nProto-Indo-European *sm̥-\nProto-Indo-European *-ih₂\nProto-Indo-European *smih₂\nProto-Indo-European *ǵʰes-\nProto-Indo-European *-lom\nProto-Indo-European *ǵʰéslom\nProto-Indo-European *-ih₂\nProto-Indo-European *ǵʰéslih₂\nProto-Indo-European *smih₂ǵʰéslih₂\nProto-Italic *smīɣeslī\nLatin mīlleder.\nFrench milli-\nEnglish milli-\nEnglish arcsecond\nEnglish milliarcsecond\nFrom milli- + arcsecond.",
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}