Definition of parsec in English:

parsec

Line breaks: par¦sec
Pronunciation: /ˈpɑːsɛk
 
/

noun

A unit of distance used in astronomy, equal to about 3.26 light years (3.086 × 1013 kilometres). One parsec corresponds to the distance at which the mean radius of the earth’s orbit subtends an angle of one second of arc.
More example sentences
  • But cosmologists are so comfortable with millions and billions that none of them feel the urge to invent a unit much beyond the light-year or the parsec.
  • I mean, all the ones that I've looked at so far are within 100 parsecs of 300 light years of the Sun.
  • For reference, one parsec is around three light years.

Origin

early 20th century: blend of parallax and second2.

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