an ordered array of the components of an emission or wave
a broad range of related objects or values or qualities or ideas or activities
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.
The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).
The set of eigenvalues of a matrix.
Of a bounded linear operator A, the set of scalar values u03BB such that the operator Au2014u03BBI, where I denotes the identity operator, does not have a bounded inverse; intended as a generalisation of the linear algebra sense.
Origin: From spectrum, from specio. (see scope)
an apparition; a specter
the several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and observed or studied either as spread out on a screen, by direct vision, by photography, or otherwise. See Illust. of Light, and Spectroscope
a luminous appearance, or an image seen after the eye has been exposed to an intense light or a strongly illuminated object. When the object is colored, the image appears of the complementary color, as a green image seen after viewing a red wafer lying on white paper. Called also ocular spectrum
Origin: [L. See Specter.]
A spectrum is a condition that is not limited to a specific set of values but can vary infinitely within a continuum. The word saw its first scientific use within the field of optics to describe the rainbow of colors in visible light when separated using a prism; it has since been applied by analogy to many fields other than optics. Thus, one might talk about the spectrum of political opinion, or the spectrum of activity of a drug, or the autism spectrum. In these uses, values within a spectrum may not be associated with precisely quantifiable numbers or definitions. Such uses imply a broad range of conditions or behaviors grouped together and studied under a single title for ease of discussion. In most modern usages of spectrum there is a unifying theme between extremes at either end. Some older usages of the word did not have a unifying theme, but they led to modern ones through a sequence of events set out below. Modern usages in mathematics did evolve from a unifying theme, but this may be difficult to recognize.
Chambers 20th Century Dictionary
spek′trum, n. the image of something seen continued after the eyes are closed: the colours of light separated by a prism, and exhibited as spread out on a screen:—pl. Spec′tra.—n. Spec′trograph, an apparatus for photographing a spectrum.—adjs. Spectrograph′ic, -al.—n. Spectrog′raphy, the art of using the spectrograph.—adj. Spectrolog′ical.—adv. Spectrolog′ically.—ns. Spectrol′ogy, the division of physical science that embraces spectrum analysis: demonology; Spectrom′eter, an instrument like a spectroscope, by means of which the angular deviation of a ray of light in passing through a prism can be accurately measured.—adj. Spectromet′ric.—n. Spec′trophōne, an adaptation of the spectroscope, in which, on the principle of the radiophone, perception of a succession of sounds takes the place of observation by the eye.—adj. Spectrophon′ic.—ns. Spec′tro-polar′iscope, a polariscope combined with a spectroscope; Spec′troscope, an instrument for forming and examining spectra of luminous bodies, so as to determine their composition.—adjs. Spectroscōp′ic, -al.—adv. Spectroscōp′ically.—ns. Spec′troscōpist, one skilled in spectroscopy; Spec′troscōpy, the use of the spectroscope and the study of spectrum analysis. [L.,—specĕre, to see.]
The Nuttall Encyclopedia
the name given to coloured and other rays of pure light separated by refraction in its transmission through a prism, as exhibited on a screen in a darkened chamber.
British National Corpus
Rank popularity for the word 'Spectrum' in Nouns Frequency: #1872
The numerical value of Spectrum in Chaldean Numerology is: 8
The numerical value of Spectrum in Pythagorean Numerology is: 7
Sample Sentences & Example Usage
Genuine goodness is threatening to those at the opposite end of the moral spectrum.
Moralistic is not moral. And as for truth -- well, it's like brown -- it's not in the spectrum. Truth is so generic.
Given the level of investments needed in fixed and mobile roll-out, and upcoming spectrum allocation, we will see consolidation come back to the table again.
Everybody is an opponent until you're bedmates, (Dish CEO) Charlie Ergen went and bought spectrum like there's no tomorrow because there is no tomorrow without spectrum.
Spectrum is the key asset required for telecom carriers to gain scale, the customer addition is OK, but with this added spectrum, now RCom will be present in circles they weren't.
Images & Illustrations of Spectrum
Translations for Spectrum
From our Multilingual Translation Dictionary
- espectreCatalan, Valencian
- spektri, kirjoFinnish
- 分光特性, スペクトルJapanese
- widmo, spektrumPolish
- спектр, диапазонRussian
- tayf, spektrumTurkish
- kölaspäktrum, späktrumVolapük
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