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spectrum (n.)

1610s, "apparition, specter," from Latin spectrum (plural spectra) "an appearance, image, apparition, specter," from specere "to look at, view" (from PIE root *spek- "to observe"). Meaning "visible band showing the successive colors, formed from a beam of light passed through a prism" first recorded 1670s. Figurative sense of "entire range (of something)" is from 1936.

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Definitions of spectrum from WordNet

spectrum (n.)
an ordered array of the components of an emission or wave;
spectrum (n.)
a broad range of related objects or values or qualities or ideas or activities;
From wordnet.princeton.edu