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Word: spectrum
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Meaning:
Noun:
- A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.
- chemistry The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).
- linearalg Of a bounded linear operator ''A'', the scalar values ? such that the operator ''A??I'', where ''I'' denotes the identity operator, does not have a bounded inverse.
- Specifically, a range of frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc. from later 17th c.
- Specter, apparition. from early 17th c.
Source: Wiktionary
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