Other
- Meridian (Chinese medicine), or channel, for blood and qi
- Meridian (perimetry, visual field), polar coordinate system for the visual field
- Meridian F.C., an English non-league football club
- Meridian Hall, listed on the National Register of Historic Places in Washington, D. C.
- Meridian Manor, listed on the National Register of Historic Places in Washington, D. C.
- Meridian Mansions, listed on the National Register of Historic Places in Washington, D. C.
- Meridian Records, a record label
- Meridian (Nosgoth), the capitol of Nosgoth in Blood Omen 2: Legacy of Kain
- Meridian (horse), American Thoroughbred racehorse, winner of 1911 Kentucky Derby
- Meridian (satellite) a series of Russian military communications satellites
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