Parsec

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The American Heritage® Dictionary of the English Language, 4th Edition
  • n. A unit of astronomical length based on the distance from Earth at which stellar parallax is one second of arc and equal to 3.258 light-years, 3.086 × 1013 kilometers, or 1.918 × 1013 miles.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. parallax second
  • the GNU version of the Collaborative International Dictionary of English
  • n. A unit of length used in describing astronomical distances, equal to 3.26 light years, or 3.086 x 1013 km. Abbreviated pc. The derived units of kiloparsec (kpc, 1000 parsecs) and megaparsec (mpc, one million parsecs) are often found in discussion of astronomical distances.
  • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • n. a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years
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    light year   
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