Also found in: Thesaurus, Acronyms, Encyclopedia, Wikipedia.
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.
(Units) a unit of astronomical distance equal to the distance from earth at which stellar parallax would be 1 second of arc; equivalent to 3.0857 × 1016 m or 3.262 light years
[C20: from parallax + second2]
a unit of distance equal to 206,265 times the distance from the earth to the sun, or 3.26 light years.
A unit of astronomical length equal to 3.26 light-years. It is based on the distance from Earth at which a star would have a parallax of one second of arc.
1. (pc) The distance at which 1 au would measure 1 sec of arc, equal to 19.16 trillion mi (30.857 trillion km) or 206,265 au or 3.26 ly (1).
2. (pc) A unit of length used for measuring astronomical distances. 1 parsec = 3.26 light years.