1. an imaginary line on the Earth’s surface connecting the North and South poles
Usage: geography
2. the highest point or peak of something
3. the time when the sun reaches its highest point in the sky; midday
Usage: astronomy

1. relating to or situated at the highest point

Examples

• The prime meridian passes through Greenwich, England.
• Ships use meridians and parallels to navigate the oceans.
• The artist reached the meridian of her career with this masterpiece.
• At meridian, the sun cast the shortest shadows of the day.
• The meridian sun blazed overhead during our desert crossing.
• Each meridian represents a different time zone on Earth.
• The company was at its meridian before the economic downturn.