1. plural of spectrum; bands of colors or wavelengths of light or other electromagnetic radiation
Usage: scientific
2. plural of spectrum; complete ranges or sequences of related things

Examples

• The scientist analyzed the spectra from distant stars.
• Different elements produce unique spectra when heated.
• The telescope captured spectra showing the composition of the nebula.
• Researchers compared the absorption spectra of various compounds.
• The political spectra in both countries have shifted significantly.
• These surveys cover broad spectra of public opinion.
• The spectra of available treatments range from conservative to aggressive.