Meaning

noun (rare) worship that admits or tolerates all gods

noun the doctrine or belief that God is the universe and its phenomena (taken or conceived of as a whole) or the doctrine that regards the universe as a manifestation of God

originFrom pan- + theism, in which pan derives from Ancient Greek πᾶν (pân), meaning “all”, and theism from Ancient Greek θεός (theós), meaning “god”. The first known use is from 1702, in an English translation of Joseph Raphson’s 1697 book De Spatio Reali seu Ente Infinito, written in Latin, which coined the Latin term pantheismus.

Etymology from Wiktionary, CC BY-SA 3.0