We don't have synonyms for samadhi yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are samadh.
(n) :
a state of transcendent union supposed to be assumed by a holy man or yogi at his death; the burial of a holy man before his death in anticipation of such a state
"2005: She had seated herself cross-legged in the samadhi position and simply ceased to be. -- Salman Rushdie, Shalimar the Clown (Vintage 2006, p. 227)"
(n) :
a state of transcendent union supposed to be assumed by a holy man or yogi at his death; the burial of a holy man before his death in anticipation of such a state
"2005: She had seated herself cross-legged in the samadhi position and simply ceased to be. -- Salman Rushdie, Shalimar the Clown (Vintage 2006, p. 227)"