1. imaginary lines on Earth’s surface running from the North Pole to the South Pole, used to measure longitude
Usage: geography
2. the highest point or peak of something; culmination
Usage: formal
3. pathways in the body through which life energy flows
Usage: traditional Chinese medicine; acupuncture

Examples

• The Prime Meridian passes through Greenwich, England.
• All meridians converge at the North and South Poles.
• The artist reached the meridian of her career with this masterpiece.
• His success was at its meridian during the 1990s.
• Acupuncturists insert needles along specific meridians.
• Traditional medicine identifies twelve main meridians in the human body.