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noun (spectr, a)
  1. A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.
  2. Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequency, frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc.
  3. (linearalg) of a bounded linear operator A, the scalar values λ such that the operator A"λI, where I denotes the identity operator, does not have a bounded inverse

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