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SYNTAX: a category which serves as a blockade for government and/or movement. The original definition (from Chomsky 1986b) is:

(i) g is a barrier for b iff (a) or (b):

    a. g immediately dominates d, d a  Blocking Category for b
    b. g is a Blocking Category for b, g =/= IP

LIT. Chomsky, N. (1986b)
Lasnik, H. and M. Saito (1992)
Rizzi, L. (1990)