: having ample extent from side to side or between limits
: having a specified extension from side to side
: extending far and wide : spacious
: in a broad (see 1broad 3a) manner : fully
: an expansion of a river
: woman
: a continuum of color formed when a beam of white light is dispersed (as by passage through a prism) so that its component wavelengths are arranged in order
: any of various continua that resemble a color spectrum in consisting of an ordered arrangement by a particular characteristic (such as frequency or energy): such as
: electromagnetic spectrum
What made you want to look up a broad spectrum? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!