Why is the ninth month called September?
"original pattern from which copies are made," 1540s, from Latin archetypum, from Greek arkhetypon "pattern, model, figure on a seal," neuter of adjective arkhetypos "first-moulded," from arkhe- "first" (see archon) + typos "model, type, blow, mark of a blow" (see type). Jungian psychology sense of "pervasive idea or image from the collective unconscious" is from 1919.
archetype ar·che·type (är'kĭ-tīp')
An original model or type after which other similar things are patterned.
In Jungian psychology, an inherited pattern of thought or symbolic image that is derived from the past collective experience of humanity and is present in the unconscious of the individual. Also called imago.