Etymology
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Words related to spectacle

*spek- 
Proto-Indo-European root meaning "to observe."

It forms all or part of: aspect; auspex; auspices; auspicious; bishop; circumspect; conspicuous; despicable; despise; episcopal; especial; espionage; espy; expect; frontispiece; gyroscope; haruspex; horoscope; inspect; inspection; inspector; introspect; introspection; perspective; perspicacious; perspicacity; prospect; prospective; respect; respite; retrospect; scope; -scope; scopophilia; -scopy; skeptic; species; specimen; specious; spectacle; spectacular; spectrum; speculate; speculation; speculum; spice; spy; suspect; suspicion; suspicious; telescope.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit spasati "sees;" Avestan spasyeiti "spies;" Greek skopein "behold, look, consider," skeptesthai "to look at," skopos "watcher, one who watches;" Latin specere "to look at;" Old High German spehhon "to spy," German spähen "to spy."
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spectacles (n.)
"glass lenses to help a person's sight," early 15c., from plural of spectacle. Earlier in singular form (late 14c.).
spectacular (adj.)

1680s, from Latin spectaculum "a sight, show" (see spectacle) + -ar. As a noun, attested by 1890. Related: Spectacularly.

spectator (n.)
1580s, from Latin spectator "viewer, watcher," from past participle stem of spectare "to view, watch" (see spectacle). Spectator sport is attested from 1943. Related: Spectatorial. Fem. form spectatress (1630s) is less classically correct than spectatrix (1610s).