A meeting is a gathering of two or more people that has been convened for the purpose of achieving a common goal through verbal interaction, such as sharing information or reaching agreement. Meetings may occur face to face or virtually, as mediated by communications technology, such as a telephone conference call, a skyped conference call or a videoconference.
Thus, a meeting may be distinguished from other gatherings, such as a chance encounter (not convened), a sports game or a concert (verbal interaction is incidental), a party or the company of friends (no common goal is to be achieved) and a demonstration (whose common goal is achieved mainly through the number of demonstrators present, not verbal interaction).
A one-time meeting is the most common meeting type and covers events that are self-contained. While they may repeat often, the individual meeting is the entirety of the event. This can include a 2006 conference. The 2007 version of the conference is a stand-alone meeting event.
A recurring meeting is a meeting that recurs periodically, such as an every Monday staff meeting from 9:00AM to 9:30 AM. The meeting organizer wants the participants to be at the meeting on a constant and repetitive basis. A recurring meeting can be ongoing, such as a weekly team meeting, or have an end date, such as a 5-week training meeting, held every Friday afternoon.
A series meeting is like a recurring meeting, but the details differ from meeting to meeting. One example of a series meeting is a monthly “lunch and learn” event at a company, church, club or organization. The placeholder is the same, but the agenda and topics to be covered vary. This is more of a recurring meeting with the details to be determined.
Source: Wikipedia