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spectrum

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spectrum/ˈspɛktrəm/noun
pluralspectra/ˈspɛktrə/orspectrums
spectrum
/ˈspɛktrəm/
noun
pluralspectra/ˈspɛktrə/orspectrums
Learner's definition of SPECTRUM  
[count]
: the group of colors that a ray of light can be separated into including red, orange, yellow, green, blue, indigo, and violet : the colors that can be seen in a rainbow
   b  technical  : an entire range of light waves, radio waves, etc.
: a complete range of different opinions, people, etc. — often + of
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