C14: via Old French from Latin spectaculum a show, from spectāre to watch, from specere to look at
Word Origin and History for spectacle
n.
mid-14c., "specially prepared or arranged display," from Old French spectacle, from Latin spectaculum "a show, spectacle," from spectare "to view, watch," frequentative form of specere "to look at," from PIE *spek- "to observe" (see scope (n.1)).