Definitions of collective intelligence

Cognitive
The cognitive powers of a group perception, action planning and coordination, memory, imagination and hypothesis generation, inquisitiveness and learning abilities. -- Pierre Lévy, Canadian Research Chair of Collective Intelligence

Social
A human enterprise in which mind-sets, a willingness to share, and an openness to the value of distributed intelligence for the common good are paramount. -- Wikipedia

Evolutionary
The capacity of human communities to evolve towards higher order complexity and harmony, through such innovation mechanisms as differentiation and integration, competition and collaboration. -- George Pór

Visual
See the "Thought Drip" video on YouTube:
www.youtube.com/watch?v=vRtYkbRGkVM