Etymology
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participatory (adj.)

"sharing, having a share or part in common with others," 1833, from participate + -ory. Participatory democracy is attested by 1965, a term from student protests and mass demonstrations, contrasted with representative democracy. The formulation of the idea, if not the phrase, seems to trace to U.S. progressive political writer Walter Lippmann (1889-1974).

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Definitions of participatory

participatory (adj.)
affording the opportunity for individual participation;
participatory democracy
From wordnet.princeton.edu