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]
WordNet (r) 3.0 (2006):
secpar
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]