All these years I thought Meridian was the line around the world as the Equator. However:

 

I just found out it is actually the line from the North Pole to the South Pole instead of the line of the Equator itself!

 

begin quote from AI Overview

A meridian is an imaginary line on Earth's surface running from the North Pole to the South Pole. 

Geography and Navigation

Longitude Lines: Meridians measure longitude, which is the distance east or west of the Prime Meridian.
Prime Meridian: The 0° meridian passes through Greenwich, England, and serves as the starting point for measuring longitude.
Time Zones: Meridians help set global time zones because the sun passes over different meridians at different times of the day. 

Other Meanings

Astronomy: A great circle on the celestial sphere that passes through the celestial poles and an observer's zenith
.
Acupuncture: An energy channel in traditional Chinese medicine where vital life force flows.
Places: The name of several locations, including Meridian, Idaho and Meridian, Mississippi. 

If you meant a specific place, company, or concept named meridian, tell me which one so I can share more details.

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  Merriam-Webster

  MERIDIAN Definition & Meaning - Merriam-Webster

  noun * 2. : a great circle of the celestial sphere passing through its poles and the zenith of a given place see azimuth illustrat...
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  Wikipedia

  Meridian (geography) - Wikipedia

  The term meridian comes from the Latin meridies, meaning "midday"; the subsolar point passes through a given meridian at solar noo...

  

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