parsec

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noun par·sec \ˈpär-ˌsek\

Definition of parsec

  1. :  a unit of measure for interstellar space that is equal to 3.26 light-years and is the distance to an object having a parallax of one second as seen from points separated by one astronomical unit

Recent Examples of parsec from the Web

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Origin and Etymology of parsec

parallax + second


First Known Use: 1913


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the point at which something begins

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