- Spectrum is a broad range of related ideas, qualities or activities.
An example of a spectrum is a group of activities used for teaching someone how to play basketball.
- Spectrum is the range of colors of wavelength energy sent out from a light source when viewed through a prism.
An example of a spectrum is a rainbow.
An example of a spectrum is a rainbow.
nounpl. spectra or spectrums
- the series of colored bands dispersed and arranged in the order of their respective wavelengths by the passage of white light through a prism or other dispersing device and shading continuously from red (produced by the longest wave visible) through violet (produced by the shortest): the six main colors of the spectrum are red, orange, yellow, green, blue, and violet, with a seventh color (indigo) sometimes specified, between blue and violet
- the intensity of any radiation or motion displayed as a function of frequency, or wavelength
- an afterimage
- a continuous range or entire extent: a wide spectrum of opinion
- radio spectrum
- electromagnetic spectrum
Origin of spectrumModern Latin special use (by Sir Isaac Newton, 1671) of Classical Latin spectrum: see specter
nounpl. spec·tra or spec·trums
- Physics a. The entire range over which some measurable property of a physical system or phenomenon can vary, such as the frequency of sound, the wavelength of electromagnetic radiation, or the mass of specific kinds of particles.b. A graphic or photographic representation of such a measurable range; a spectrogram.
- A range of radio frequencies assigned by a regulatory agency for use by a given group or organization.
- a. A range of values of a quantity or set of related quantities.b. A broad sequence or range of related qualities, ideas, or activities: the whole spectrum of 20th-century thought.
Origin of spectrumLatin, appearance, from specere, to look at; see spek- in Indo-European roots.
(plural spectra or spectrums)
- 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.]
- (chemistry) The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).
- (mathematics, linear algebra) The set of eigenvalues of a matrix.
- (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.
- cepstrum, crumpets
From Latin spectrum (“appearance, image, apparition”), from speciō (“look at, view”). (see scope)
spectrum - Computer Definition
Generally referring to frequency spectrum. See electromagnetic spectrum.
The range of electromagnetic radiation (electromagnetic waves) in our known universe, which includes visible light. The radio spectrum, which includes both licensed and unlicensed frequencies up to 300 GHz has been defined worldwide in three regions: Europe and Northern Asia (Region 1); North and South America (Region 2), and Southern Asia and Australia (Region 3). Some frequency bands are used for the same purpose in all three regions while others differ. See satellite bands and optical bands. Higher Frequencies Frequencies above 40 GHz have not been licensed, but are expected to be made available in the future as the technology is developed to transmit at these smaller wavelengths (higher frequencies). The spectrum can be viewed in meticulous detail from the Federal Communications Commission (FCC) and National Telecommunications and Information Administration (NTIA) by visiting www.fcc.gov/oet/spectrum and www.ntia.doc.gov/osmhome/osmhome.html. See electromagnetic radiation and wave.