knowledge of spiritual matters; mystical knowledge.
Origin of gnosis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
noun plural -ses (-siːz)
supposedly revealed knowledge of various spiritual truths, esp that said to have been possessed by ancient Gnostics
Word Origin for gnosis
C18: ultimately from Greek: knowledge, from gignōskein to know
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
"special knowledge of spiritual mysteries," 1703, from Greek gnosis "investigation, knowledge," in Christian writers, "higher knowledge of spiritual things" (see gnostic (adj.)).
Online Etymology Dictionary, © 2010 Douglas Harper