(a) As used in this chapter:
(1) “State-aided district” means a district to which an apportionment has been made under this chapter.
(2) “Acquiring district” means a district in which all or a part of, a state-aided district or an applicant district has been included.
(3) “Original district” means a state-aided or applicant district included in whole or in part in an acquiring district.
(b) For the purposes of this article as it applies to an original district or to an acquiring district, the effective date of any change of boundaries, annexation, formation of a new district, or other reorganization shall be the date the action became effective for the purposes of Section 4060.