What is a spectrum?

What is a spectrum? Here are some definitions.

Noun (obsolete) Specter, apparition. [from early 17th c.] A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes. Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc. [from later 17th c.] (psychology) The autism spectrum. (chemistry) The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.). (mathematics) The set of eigenvalues of a matrix. (mathematics) Of a bounded linear operator A, the set of scalar values λ such that the operator A—λI, where I denotes the identity operator, does not have a bounded inverse; intended as a generalisation of the linear algebra sense. Find more words! 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What is the opposite of spectrum? Sentences with the word spectrum Words that rhyme with spectrum What is the plural of spectrum? What is the adverb for spectrum? What is the adjective for spectrum? What is the noun for spectrum? Translations for spectrum Nearby Definitions spectrous spectrotrons spectrotron spectrotemporal spectrosomes spectrosome spectrum analyser spectrum analysers spectrum analyzer spectrum analyzers spectrum disorder spectrum disorders 8-letter Words Starting With s sp spe spec spect spectr spectru