Definitions .—
For purposes of this subparagraph, the term—
(I)#
“controlled group of corporations” has the meaning given such term by section 1563(a), except that “50 percent” shall be substituted for “80 percent” each place it appears,
(II)#
“employer corporation” means a corporation which is an employer maintaining the plan, and
(III)#
“parent corporation” has the meaning given such term by section 424(e).