vicinal

[vis-uh-nl] /ˈvɪs ə nl/
adjective
1.
of, pertaining to, or belonging to a neighborhood or district.
2.
neighboring; adjacent.
3.
Crystallography. noting a plane the position of which varies very little from that of a fundamental plane of the form.
Origin
1615-25; < Latin vīcīnālis, equivalent to vīcīn(us) near + -ālis -al1; see vicinity
British Dictionary definitions for vicinal

vicinal

/ˈvɪsɪnəl/
adjective
1.
neighbouring
2.
(esp of roads) of or relating to a locality or neighbourhood
3.
(chem) relating to or designating two adjacent atoms to which groups are attached in a chain
Word Origin
C17: from Latin vīcīnālis nearby, from vīcīnus, from vīcus a neighbourhood