Adi-Buddha
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In Buddhism, the Adi-Buddha is the "Primordial Buddha." The term refers to a self-emanating, self-originating Buddha, present before anything else existed. Samantabhadra/Samantabhadri and Vajradhara are Adi-Buddha.
Ati Yoga (or Primordial Yoga), which is another name of Dzogchen, employ Adi-Buddha sadhana. NB: Ati and Adi are different orthographic representations of phonemes of the language of Uddiyana which equate to 'primordial' according to Chöogyal Namkhai Norbu.