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n specter | Specter, apparition. (defdate|from early 17th c.)

n A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.

n Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequency|frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc. (defdate|from later 17th c.)

n (chemistry) The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).

n (mathematics|linear algebra) The set of eigenvalues of a matrix.

n (mathematics|functional analysis) 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.

n (rfdef|lang=en)