I. (ˈ)s(h)peŋ|(g)lirēən adjective
Usage: usually capitalized
Etymology: Oswald Spengler died 1936 German writer on philosophy of history who developed the theory + English -ian (adjective suffix)
: of or relating to a theory of world history that holds that major cultures (as the Egyptian, Chinese, or Mayan) undergo similar cyclical developments from birth to maturity to decay, that modern western civilization also is undergoing such a development, and that its decline is consequently predictable
II. noun
( -s )
Usage: usually capitalized
Etymology: Oswald Spengler died 1936 + English -ian (n. suffix)
: a follower of the historian Spengler or an advocate of a Spenglerian philosophy of history