" Extramuros: (1) In Old Orth, literally “outside the walls.” Often used in reference to the walled city-states of that age. (2) In Middle Orth, the non-mathic world; the turbulent and violent state of affairs that prevailed after the Fall of Baz. (3) In Praxic Orth, geographical regions or social classes not yet enlightened by the resurgent wisdom of the mathic world. (4) In New Orth, similar to sense 2 above, but often used to denote those settlements immediately surrounding the walls of a math, implying comparative prosperity, stability, etc. —THE DICTIONARY, 4th edition, A.R. 3000 "

― Neal Stephenson , Anathem