The United Nations General Assembly set the date on 23 December 1994, in resolution 49/214 on the International Decade of the World's Indigenous People, deciding that the International Day should be observed every year during the Decade on 9 August. The Assembly took 9 August on the recommendation of its own Working Group on Indigenous Populations, because it is the anniversary of the first day of that group's first meeting, in Geneva in 1982. No separate Indian founding instrument for the day has been documented; India observes the international day.
A word assembled in the 1930s
The term joins adi, meaning of earliest times or from the beginning, to vasi, meaning inhabitant or resident. The World Directory of Minorities and Indigenous Peoples dates the coinage to the 1930s.
The word's use is regional. IWGIA's annual chapter on India notes that the Scheduled Tribes are usually called Adivasis in central India.


