a slogan used by and associated with flower children of the 1960s and 1970s as representative of a movement for nonviolence, passive resistance, and universal love.
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British Dictionary definitions for flower power
informal a youth cult of the late 1960s advocating peace and love, using the flower as a symbol; associated with drug-taking. Its adherents were known as flower children or flower people
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012