Spectrum Meaning

/ˈspɛktɹəm/
B2

Definition, CEFR level B2, pronunciation, examples, and quiz.

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

nounSpecifically, a range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc.

You can see the colors of the spectrum in a rainbow.
There are many ideological similarities between parties at the extreme ends of the political spectrum.
A spectrum is formed by a ray of light passing through a prism.
CEFR Practice Quiz
The prism in the lab revealed a continuous ____ of colors from red to violet.
CEFR Practice Quiz (Alternate)
The colors of the rainbow represent the visible ____ of light that human eyes are able to see.

Etymology tree Proto-Indo-European *speḱ- Proto-Indo-European *-yeti Proto-Indo-European *spéḱyeti Proto-Italic *spekjō Latin speciō Proto-Indo-European *-tḗr Proto-Indo-European *-trom Proto-Italic *-trom Latin -trum Latin spectrumbor. English spectrum From Latin spectrum (“appearance, image, apparition”), from speciō (“look at, view”). Doublet of specter. See also scope.

"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:
"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:
"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:

Explore More B2 Vocabulary Words

CEFR Practice Quiz
The prism in the lab revealed a continuous ____ of colors from red to violet.
CEFR Practice Quiz (Alternate)
The colors of the rainbow represent the visible ____ of light that human eyes are able to see.

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