meridian

US /məˈrɪd.i.ən/
UK /məˈrɪd.i.ən/
"meridian" picture
1.

a circle of constant longitude passing through a given place on the earth's surface and the terrestrial poles

:
•
The Prime Meridian passes through Greenwich, London.
•
Navigators use meridians to determine longitude.
:
longitude lineline of longitude
2.

a period of greatest splendor, prosperity, or power

:
•
The empire reached its meridian during the 18th century.
•
She is now in the meridian of her career.
:
zenithpeakapexpinnacleclimax