1. having the same boundaries or limits; sharing a common border
2. coinciding in scope, duration, or extent; equivalent in range or significance

Examples

• The city limits are coterminous with the county boundaries.
• The two school districts are coterminous, serving the same geographic area.
• Her authority is coterminous with her job title.
• The treaty's duration is coterminous with the peace agreement.
• The park's borders are coterminous with the protected forest zone.
• His responsibilities are coterminous with those of the previous manager.