* Meridian: This is the most accurate synonym as longitude is measured by the angle east or west of a prime meridian.
* Angular distance: This is a more general term that describes the distance between two points, measured as an angle.
* East-west position: This is a less technical way of describing longitude, focusing on its role in determining location.
* Geographical coordinate: This refers to a broader concept that includes both longitude and latitude.
* Line of longitude: This refers to an imaginary line that runs from the North Pole to the South Pole, indicating a specific longitude.
The best word to use will depend on the specific context and the level of formality required.