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arc second

noun
1.
Astronomy, second2 (def 4).
Also, arc-second.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for arc second

arcsec

/ˈɑːksɛk/
noun
1.
1/3600 of a degree of an angle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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5
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