1) General subject: adjacent, adjoining, allied, communicating, conterminous, contiguous, coterminous, neighbor, neighboring, neighbour, subcontractory, limitrophe
2) Geology: abutting, conterminate
3) Medicine: interfacing
4) Engineering: contiguous (об углах), related
5) Anatomy: approximal
6) Mathematics: neighbouring
7) Architecture: next
8) Information technology: incident
9) Cartography: closely-spaced
10) Business: complementary
11) Polymers: border-line
12) Makarov: adjacent (об органе), conterminal, contiguous (переходящий один в другой), incidental, related (о проблемах), tangent, vicinal
13) Tengiz: adjacent (to smth.)
Универсальный русско-английский словарь. Академик.ру. 2011.