SPECTRA — Definition of SPECTRA
noun
1
A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.
2
Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc.
3
The autism spectrum.
4
The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).
📚 Source: en.wiktionary.org/wiki/spectra
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