Extraordinary
late Middle English: from Latin extraordinarius, from extra ordinem ‘outside the normal course of events’.
wiktionary
From Latin extrāōrdinārius, from extrā ōrdinem(“outside the order”); equivalent to extra- + ordinary. Doublet of extraordinaire.
etymonline
extraordinary (adj.)
"being beyond or out of the common order or rule; not of the usual, customary, or regular kind," early 15c., from Latin extraordinarius "out of the common order," from extra ordinem "out of order," especially the usual order, from extra "out" (see extra-) + ordinem, accusative of ordo "row, rank, series, arrangement" (see order (n.)).
Of officials, etc., "outside of or in addition to the regular staff," often "temporarily employed for a specific purpose," from 1580s. Also from 1580s in the sense of "remarkable, uncommon, rare, wonderful." Related: Extraordinarily; extraordinariness.
