Sanskrit परमार्थसत्य "asbsolute truth" from para, “absolute, supreme,” parama, “that which knows, or the consciousness,” artha, “that which is known,” satya, “existence, Truth.” In synthesis, “The supreme knowledge of all that exists: TRUTH.”
1) A being of very high development; an inhabitant of the Absolute.
"...the Great Breath is the Cosmic Christ, Avalokiteshvara, Kwan-Yin, the Melodious Voice, the Army of the Voice, whose head is a paramarthasatya known in this humanity with the name of Jesus Christ... the greatest initiate who has come into the world." -Samael Aun Weor, Kundalini Yoga
2) The ultimate truth, as opposed to conventional truth (samvriti-satya) or relative truth of the manifested world.