The AI-powered English dictionary
plural spectra or spectrums
A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes. quotations examples
As Mr. Obama prepared to take the oath, his approval rating touched a remarkable 70 percent in some polling — a reflection of good will across the political spectrum.
2012 November 7, Matt Bai, “Winning a Second Term, Obama Will Confront Familiar Headwinds”, in New York Times
Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc. quotations examples
Current 3G technologies can send roughly 1 bit of data - a one or a zero - per second over each 1 Hz of spectrum that the operator owns.
2010 October 30, Jim Giles, “Jammed!”, in New Scientist
(psychology, education, usually with the) The autism spectrum. quotations
He punctuated his words with a look into my eyes that might have been read as threatening or menacing by anyone who was not on the spectrum. But I am on the spectrum, and so I stared back at him.
2022, Percival Everett, Dr. No, Influx Press (2023), page 110
(chemistry) The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.). examples
(mathematics, linear algebra) The set of eigenvalues of a matrix. examples
(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. examples
(abstract algebra, algebraic geometry) The set, denoted Spec(R), of all prime ideals of a given ring R, commonly augmented with a Zariski topology and considered as a topological space. examples
(obsolete) Specter, apparition.
The image of something seen that persists after the eyes are closed. examples