Given a lexical head L, we say that a position is "L-related" if it is the specifier or complement of a feature of L. - Chomsky (1995), a pag.64
[…] we say that a position is "L-related" if it is in a local relation to an L-feature, that is, in the internal domain or checking domain of a head with an L-feature. - Chomsky (1995), a pag.196