taking part or being involved in something, usually a decision, process or activity (5)

‘those who have long-term physical, mental, intellectual or sensory impairments which in interaction with various barriers may hinder their full and effective participation in a society on an equal basis with others’ (UN, 2006) (1)

natural or technical (infrastructure) barriers that prevent access or participation, e.g. long distances to walk, uneven paths, steps (also known as environmental barriers) (2)