NEOPLATONISM
Neoplatonism
(noun) a system of philosophical and theological doctrines composed of elements of Platonism and Aristotelianism and oriental mysticism; its most distinctive doctrine holds that the first principle and source of reality transcends being and thought and is naturally unknowable; “Neoplatonism was predominant in pagan Europe until the 6th century”; “Neoplatonism was a major influence on early Christian writers and on later medieval and Renaissance thought and on Islamic philosophy”
Source: WordNet® 3.1
Ne`o*pla"to*nism, n. Etym: [Neo- + Platonism.]
Definition: A pantheistic eclectic school of philosophy, of which Plotinus
was the chief (A. D. 205-270), and which sought to reconcile the
Platonic and Aristotelian systems with Oriental theosophy. It tended
to mysticism and theurgy, and was the last product of Greek
philosophy.
Source: Webster’s Unabridged Dictionary 1913 Edition