20 U.S. Code § 4072 - Definitions
As used in this subchapter—
(1) The term “secondary school” means a public school which provides secondary education as determined by State law.
(2) The term “sponsorship” includes the act of promoting, leading, or participating in a meeting. The assignment of a teacher, administrator, or other school employee to a meeting for custodial purposes does not constitute sponsorship of the meeting.
(3) The term “meeting” includes those activities of student groups which are permitted under a school’s limited open forum and are not directly related to the school curriculum.