I. ˈbȯ(r)də(r)ˌland, -laa(ə)nd noun
1.
a. : territory at or near a border : frontier
rugged folk of the borderland
b. : an outlying region ; especially : fringe area
living from hand to mouth on the borderland of society
c. : the farthest point proper to or within the scope of a given state, condition, or field of activity : boundary , limits
going beyond the borderland of science
2. : a vague region or condition that lacks precise demarcation : twilight zone
the borderland between the area of undisputed rights and that of undisputed wrongs — F.L.Mott
II. adjective
: borderline