Etymology
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parsec (n.)

interstellar distance measure, 1913, from first elements of parallax second. It is the distance at which an object has parallax (viewed from Earth at an interval of six months and halved) of one second of arc, or about 3.26 light-years.

updated on May 09, 2020

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Definitions of parsec from WordNet

parsec (n.)
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;
Synonyms: secpar
From wordnet.princeton.edu, not affiliated with etymonline.