As used in this article: 1. "Meeting" means the official convening of a public body for the purpose of conducting public business, including the use of videoconferencing for attendance and participation by the members of the public body.

1. 2. "Public body" means any entity, for which a quorum is required in order to conduct public business and which consists of two or more members, performing a governmental function for the state or for an agency or department thereof, or for a public corporation as defined in section sixty-six of the general construction law, or committee or subcommittee or other similar body of such public body.
2. 3. "Executive session" means that portion of a meeting not open to the general public.