Meaning of parsec

par•sec

Pronunciation: (pär'sek"), [key]
— n. Astron.
  1. a unit of distance equal to that required to cause a heliocentric parallax of one second of an arc, equivalent to 206,265 times the distance from the earth to the sun, or 3.26 light-years.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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