There are several ongoing efforts to create a definition for citizen science or to adopt the best terminology for public engagement in research activities.
One good description of citizen science used by the European Commission is:
Citizen Science refers to the general public engagement in scientific research activities when citizens actively contribute to science either with their intellectual effort or surrounding knowledge or with their tools and resources.
The LIBER Roadmap to Open Science makes a set of four strong recommendations to European research libraries, recommendations which remains guidelines for our working group.
Citizen Science, or the participation of the general public in the scientific research process, is an important element in establishing new links between science and society. It is thus essential to implementing Open Science, can contribute to innovation tailored to the needs of society, lead to reciprocal learning and foster a scientific culture across society as a whole.
The LIBER Citizen Science WG formally began in March 2019 and held its kick-off meeting during the LIBER Annual Conference in Dublin (June 2019). It is part of the LIBER Steering Committee Innovative Scholarly Communication, chaired by Dr. Giannis Tsakonas