PNG images: Meeting icons
One Merriam-Webster dictionary defines a meeting as "an act or process of coming together" - for example "as [...] an assembly for a common purpose [...]".
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.
One can distinguish a meeting 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 through verbal interaction).