Meaning

noun something or someone seen (especially a notable or unusual sight)

noun an elaborate and remarkable display on a lavish scale

noun a blunder that makes you look ridiculous; used in the phrase `make a spectacle of' yourself

originFrom Middle English spectacle, from Middle French spectacle, from Latin spectāculum (“a show, spectacle”), from spectō (“to see, behold”), frequentative of speciō (“to see”). See species. Doublet of spectaculum.

Etymology from Wiktionary, CC BY-SA 3.0