Conterminous:
3 : enclosed within one common boundary : the 48 conterminous states
[Merriam-Webster]
Noted in a Letter to the Editor, NewScientist (20 May 2017):
The past and the present become conterminous – there are no boundaries in the experience of time. Especially in the late afternoon and evening, the person with dementia often becomes confused in the midst of “sundowning”. [Bob Kahn]
