noun an organised gathering for the celebration of counterculture lifestyles and values. Originally applied to an event in San Francisco in January 1967, and then to similar events elsewhere. Organisers ('inspirers') of that event wrote: 'When the Berkeley political activists and the love generation of the Haight Ashbury and thousands of young men and women from every state in the nation embrace at the gathering of the tribes for a Human Be-In at polo field in Golden Gate Park the spiritual revolution will be manifest and proven' US, 1967