noun

1. The south.

2. Midday, noon.

3. A great circle passing through the poles of the celestial sphere and the zenith for a particular point on the earth's surface.

Synonyms: noon, noontide

adjective

1. Meridional; relating to a meridian.

2. Relating to noon

3. Relating to the highest point or culmination.

   “meridian splendour”