n.
Pronunciation: - ˌ l ī n
Function: adjective
Date: 1907
1 a : being in an intermediate position or state : not fully classifiable as one thing or its opposite <a borderline state between waking and sleeping> b : not quite up to, typical of, or as severe as what is usual, standard, or expected < borderline intelligence> < borderline hypertension> c : characterized by psychological instability in several areas (as interpersonal relations, behavior, and identity) but only with brief or no psychotic episodes <a borderline personality disorder>
2 : situated at or near a border <a borderline town>
– borderline noun