conterminous

Having common borders

Conterminous means sharing a boundary or having the same boundaries.

The term appears most often in geography: the conterminous United States refers to the 48 states that share borders, excluding Alaska and Hawaii.

Two properties are conterminous if they abut each other.

The word also means coextensive in time or scope: Her tenure was conterminous with the company's growth period.

Coterminous is a common variant.

adjacent

abutting

Sharing a common border

flanking · bordering · touching · next-door · proximate · side-by-side · tangent · meeting · connecting · edging

coextensive

coincident

Occurring simultaneously

identical · same · equal · equivalent · corresponding · aligned · synchronous · parallel · commensurate · coordinate

territorial

bordering

Sharing an edge with

cross-border · transboundary · interstate · international · binational · borderland

boundary

border

Outer edge or limit

limit · margin · demarcation · line · terminus · extent · reach · confine · bound · periphery

Opposites
spatial adjacency/boundary sharing

conterminousnonadjacent

Not directly beside

noncontiguous · distant · remote · apart · separated

temporal coextension

conterminousnonsynchronous

Not occurring together temporally

asynchronous · successive · sequential · nonconcurrent · staggered

connection/unity

conterminousdisjoined

Separated at joints

disconnected · severed · divided · unconnected · dissociated

Family

contiguous, coterminous

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