Reading Theme:
Spectrum Definition, Usage & Common Examples (2 meaning)
Meaning 1：a complete range (spectrum)
spectrum
/ˈspektrəm/
n.
a complete range of something, from one extreme to the other.
a complete range
➕
/ə kəmˈpliːt reɪndʒ/
n.
This sense describes a continuous sequence or wide variety of things, ideas, or conditions, extending between two different or opposite points.
📘 Details & Usage
📖 Root Explanation
From Latin 'spectrum' meaning 'appearance, image, apparition', from 'specere' (to look at).
💡 Mnemonic
A SPECtacle shows a spectRUM of colors. Link 'spect-' (to look) with seeing a full range.
📖 Example
In our class, there is a spectrum of opinions on how to spend the holiday, from quiet reading at home to adventurous hiking.
Within our classroom, opinions on holiday activities cover the entire gamut, ranging from staying home with a book to going on a challenging hike.
🔗 Collocations
broad spectrum – a very wide range of different things or people
full spectrum – the entire range from one end to the other
across the spectrum – covering all the different parts or opinions within a range
🔄 Synonyms
🚫 Antonyms
single point (n.) – one specific item or idea, not a range
uniformity (n.) – the quality or state of being all the same
🌱 Derivatives
spectral (adj.) – of or like a spectrum; of or relating to a ghost
spectroscopy (n.) – the branch of science concerned with the investigation and measurement of spectra
📖 Cultural Story
First used in optics (1660s) for the band of colors. Its metaphorical use for a 'wide range' of anything (e.g., political spectrum) emerged in the mid-20th century.
Meaning 2：band of colors (rainbow) (spectrum)
spectrum
/ˈspektrəm/
n.
the band of colors that make up white light, like in a rainbow.
band of colors (rainbow)
➕
/ˈbænd əv ˈkʌlərz (ˈreɪnboʊ)/
n.
This is the scientific term for the band of colors (red, orange, yellow, green, blue, indigo, violet) produced when white light is dispersed, as seen in a rainbow.
📘 Details & Usage
📖 Example
A prism can split a beam of white sunlight into a beautiful rainbow spectrum on the wall.
A triangular glass prism can separate a ray of white sunlight, casting a lovely band of rainbow colors onto the surface of a wall.
🔗 Collocations
visible spectrum – the portion of the electromagnetic spectrum that is visible to the human eye
light spectrum – the range of wavelengths of electromagnetic radiation
color spectrum – the distribution of colors produced when light is dispersed
🔄 Synonyms
rainbow (n.) – an arch of colors visible in the sky, caused by the refraction and dispersion of sunlight
prismatic colors (n.) – the colors produced by the dispersion of light through a prism
🚫 Antonyms
monochromatic light (n.) – light consisting of a single wavelength or color
🌱 Derivatives
spectrometer (n.) – an apparatus used for recording and measuring spectra
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