spectrum

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun an ordered array of the components of an emission or wave
noun a broad range of related objects or values or qualities or ideas or activities

From Latin spectrum (“appearance, image, apparition”), from speciō (“look at, view”). Doublet of specter. See also scope.

The color orange indicated number 2 in the spectrum sequence. — The Girl Philippa, Robert W. (Robert William) Chambers
It isn't any of the colors of the spectrum at all. — The Colors of Space, Marion Zimmer Bradley
Our eyes see the colors of the spectrum, from red to violet. — Astounding Stories of Super-Science January 1930, Unknown

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