1. in a manner that shares a common boundary; with borders that touch or coincide
Usage: formal; often used in geographical or legal contexts
2. at the same time; simultaneously
Usage: rare; archaic

Examples

• The two states lie conterminously along the river, sharing a natural boundary.
• The properties extended conterminously across the valley floor.
• The northern and southern districts developed conterminously with the expansion of the city.
• These territorial claims were established conterminously in the treaty of 1842.
• The two regions grew conterminously as trade routes connected them.