A term used by Ra essentially as a noun in the same fashion as Merriam-Webster defines it: “A whole made up of complicated or interrelated parts.” Ra speaks of it this way in context of the archetypes: “A concept complex is a complex of concepts just as a molecule is a complex structure made up of more than one type of energy nexus or atom.”
Some examples include: mind/body/spirit complex, mind complex, body complex, spirit complex, social memory complex, sound vibrational complex, and many more.
It may also mean a complex of something. When used this way, it may denote either a whole made of up interrelated parts (as in the above definition), or an assortment of multiple things, e.g.: “a complex of thought, ideas, and actions.”