noun

meridian

meridian, line of longitude, highest point, zenith

The Prime Meridian passes through Greenwich.

The Prime Meridian passes through Greenwich.

The sun reaches its meridian at noon.

The sun reaches its meridian at noon.

((a/the)) meridian a line of longitude The Prime Meridian is at 0 degrees longitude.

Synonyms: longitude line, zenith

From Latin 'merīdiānus' (of midday), from 'merīdiēs' (midday), which is composed of 'medius' (mid) + 'diēs' (day).

Think of 'meri-dian' as 'mid-day'. This connects to the idea of noon, when the sun is at its highest point, which defines the line.

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