an ordered array of the components of an emission or wave
"The spectrometer displayed a spectrum revealing distinct peaks for each element in the star's emitted light."
a broad range of related objects or values or qualities or ideas or activities
"The new policy covers the entire spectrum of employee benefits, from health insurance to retirement planning."
A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.
"The committee debated where to place the new policy on the spectrum between strict regulation and total freedom."
In plain English: A spectrum is a range of different things that change gradually from one end to the other, like colors going from red to violet.
"The political spectrum ranges from far left to far right."
Usage: Use spectrum to describe the full range of possibilities within a specific category, such as colors in light or opinions on an issue. Avoid using it for discrete lists where distinct items are clearly separated rather than forming a continuum.
The word spectrum comes from the Latin term spectrum, meaning "appearance," "image," or "apparition." It is derived from the verb speciō, which means "to look at" or "to view."