Definition

1. Adjective:
   • Having the same boundaries or extent; coextensive in space, time, or meaning: Describing things that share identical limits or scope.
   • Sharing a common boundary; adjacent; touching: Describing areas or objects that are next to each other and meet at a border.
   • Connected without a break; contiguous: Describing a continuous, unbroken expanse.

Usage Examples

• Adjective:
  • The district is conterminous with the old county boundaries. (The district has exactly the same borders as the old county.)
  • Canada is conterminous with the United States along its southern border. (Canada shares a long, touching border with the US.)
  • The study's timeframe was conterminous with the patient's treatment period. (The study lasted for the exact same duration as the treatment.)

Advanced Usage

• "conterminous with": This is the most common prepositional phrase used with this adjective to indicate what something shares a boundary or extent with.
  • The national park is conterminous with the mountain range.
• In legal or geographical contexts, it often describes precise jurisdictional or territorial limits.
  • The city's jurisdiction is conterminous with the school district's.

Variants and Related Words

• Coterminous (adj): An alternative spelling with identical meaning.
  • The two terms are coterminous.
• Contiguous (adj): Sharing a common border; touching. (Often used interchangeably with for physical adjacency, but more strongly implies identical boundaries).
• Adjacent (adj): Next to or adjoining something else.
• Coextensive (adj): Extending over the same space, time, or scope.

Synonyms

• Adjacent
• Adjoining
• Bordering
• Neighboring
• Coextensive
• Contiguous

Related Phrases

• Conterminous states/provinces/etc.: A formal phrase used to describe political units that share a boundary.
  • The conterminous United States refers to the 48 adjoining states and Washington, D.C.

Notes on Meaning

• The word emphasizes precision in shared limits. While "adjacent" things are simply next to each other, conterminous things have boundaries that align exactly.
• It can apply to abstract concepts like time, scope, or meaning, not just physical space.
  • His authority was conterminous with his responsibilities. (His authority was limited to and exactly covered his responsibilities.)

Adjective

1. being of equal extent or scope or duration
2. having a common boundary or edge; abutting; touching; Massachusetts and Conncecticut"
   • Rhode Island has two bordering states
   • the side of Germany conterminous with France
   • Utah and the contiguous state of Idaho
   • neighboring cities
3. connecting without a break; within a common boundary
   • the 48 conterminous states
   • the contiguous 48 states