Adjacent Words

parsec definitions

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WordNet (r) 3.0 (2005)

n
1: a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years [syn: parsec, secpar]

Merriam Webster's

noun Etymology: parallax + second Date: 1913 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

Oxford Reference Dictionary

n. a unit of stellar distance, equal to about 3.25 light years (3.08 x 10(16) metres), the distance at which the mean radius of the earth's orbit subtends an angle of one second of arc. Etymology: PARALLAX + SECOND(2)