parsecPronunciation: /ˈpɑːsɛk/Definition of parsec noun a unit of distance used in astronomy, equal to about 3.25 light years (3.08 × 1016 metres). One parsec corresponds to the distance at which the mean radius of the earth’s orbit subtends an angle of one second of arc. Origin: early 20th century: blend of parallax and second2parsec in other Oxford dictionaries Definition of parsec in the US English dictionary
