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What does sidereal mean?

Looking for the meaning or definition of the word sidereal? Here's what it means.

Adjective
  1. Of or relating to the stars.
  2. (astronomy) Relating to a measurement of time relative to the position of the stars.
  3. (astronomy) Relating to a measurement of time relative to the point of the vernal equinox.
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Examples
Two physical variables that have been linked to free-response ESP scores, geomagnetism and local sidereal time, are additionally examined.
Over the past few sidereal days more radio signals from an as-yet-unidentified source have been detected.
Two clocks were used, one keeping mean time i.e. 24 hours a day, the other sidereal time of 23 hours, 56 minutes and 4 seconds to the day.
Because of the precession of the equinoxes the tropical year is shorter by about 21 minutes than the sidereal year.
The reason that sidereal days are shorter is that while the Earth rotates on its axis, it is also moving around the Sun.
Each year is still equivalent to the sidereal period of the Earth, one revolution around the Sun.

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