coterminous

Etymology

From Latin conterminus, from con- (“with”) + terminus (“border, end”). The spelling with co- instead of con- is probably influenced by the related prefix co-.

adj

1. Meeting end to end or at the ends.
2. (geography) Having matching boundaries; or, adjoining and sharing a boundary.
   New York's borough of Brooklyn and Kings County are coterminous.
   To get a building warrant he had to show the plans to "coterminous proprietors", neighbours with whom his property shared a boundary.
   These eighty-two parishes were roughly coterminous with the existing seigneuries, but not always so. 1915, William Bennett Munro et al., The Seigneurs of Old Canada (Chronicles of Canada), volume 5
3. (by extension) Having the same scope, range of meaning, or extent in time.
   But it is purely fantastic unless we bear in mind that the governing class has been continually compelled to enlarge itself, and that its tendency is reluctantly to go on doing so until in the end it will be coterminous with the "governed class." 1919, Robert Lynd, Old and New Masters
   From this it follows at once that language and thought are not strictly coterminous. 1921, Edward Sapir, Language: An introduction to the study of speech
   The elision of moral and moralising arguments is common, but the two aren't coterminous. 2022, China Miéville, chapter 4, in A Spectre, Haunting: On the Communist Manifesto, →OCLC
4. (law) Said of linked or related property leases that expire together.