Definitions

1. noun

A unit of length used to measure the distance of stars and other celestial objects from Earth, equal to 3.26 light-years.

“The new telescope can observe stars up to 100 parsecs away.”

2. noun

A unit of distance in astronomy, equivalent to the distance a star would travel in one year at a speed of one astronomical unit per second.

“The parsec is an important unit in the measurement of interstellar distances.”