diffraction: meaning, definition, pronunciation and examples
LowFormal, Technical, Academic
Quick answer
What does “diffraction” mean?
The spreading or bending of waves (especially light or sound) around obstacles or through narrow openings.
Audio
Pronunciation
Definition
Meaning and Definition
The spreading or bending of waves (especially light or sound) around obstacles or through narrow openings.
In a broader sense, any process where a wave changes direction and spreads out when encountering an obstruction or aperture, fundamental to wave physics and various imaging techniques.
Dialectal Variation
British vs American Usage
Differences
No significant spelling or usage differences. Pronunciation differs slightly in the stressed vowel (see IPA).
Connotations
Identical technical connotations in both varieties.
Frequency
Equally low frequency in both BrE and AmE, confined to scientific/technical domains.
Grammar
How to Use “diffraction” in a Sentence
[subject] undergoes/causes/shows diffractiondiffraction of [wave type] by/around [obstacle]to analyse/detect/measure diffractionVocabulary
Collocations
Examples
Examples of “diffraction” in a Sentence
verb
British English
- The radio waves will diffract around the hill, providing some signal to the valley.
- We studied how sound diffracts at the edge of a barrier.
American English
- The laser light diffracts when it passes through the narrow slit.
- Radar signals can diffract over the horizon under certain conditions.
adjective
British English
- The diffraction pattern on the screen showed a series of bright and dark bands.
- They used a diffraction grating to separate the light into its component colours.
American English
- The diffraction limit of the telescope determines its ultimate resolution.
- Diffraction effects become significant when the wavelength is comparable to the aperture size.
Usage
Meaning in Context
Business
Virtually never used.
Academic
Core term in physics, chemistry (crystallography), and engineering. Common in research papers on optics, acoustics, and material science.
Everyday
Extremely rare. Might be mentioned in simplified explanations of rainbows, CD reflections, or in advanced hobbyist contexts (astronomy, photography).
Technical
Fundamental concept. Used in optics design, acoustic engineering, antenna theory, and structural biology (e.g., determining protein structures via X-ray diffraction).
Vocabulary
Synonyms of “diffraction”
Neutral
Vocabulary
Antonyms of “diffraction”
Watch out
Common Mistakes When Using “diffraction”
- Confusing 'diffraction' with 'refraction'.
- Using it as a verb (e.g., 'The light diffracts' is correct, but 'diffraction' is the noun).
- Misspelling as 'defraction'.
FAQ
Frequently Asked Questions
No. Diffraction is the bending/spreading of waves around obstacles or apertures. Refraction is the bending of waves when they pass from one medium into another (e.g., from air into water), changing speed.
Yes, but it's often subtle. Examples include the coloured patterns on a CD or DVD, the soft edges of shadows, and the slight blurring of stars when viewed through a small telescope.
A diffraction grating is an optical component with a regular, repeating pattern of lines or slits. It works by causing constructive and destructive interference of diffracted light, powerfully separating light into its different wavelengths (colours).
It is a fundamental proof of the wave nature of light and matter. Technologically, it limits the resolution of microscopes and telescopes but also enables key analytical methods like X-ray crystallography, which is used to determine molecular structures.
The spreading or bending of waves (especially light or sound) around obstacles or through narrow openings.
Diffraction is usually formal, technical, academic in register.
Diffraction: in British English it is pronounced /dɪˈfræk.ʃən/, and in American English it is pronounced /dɪˈfræk.ʃən/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Imagine light FRACTURING into colours as it passes through a crack (a FRACTION of an opening) – DIFFRACTION.
Conceptual Metaphor
Waves flowing like water around a rock in a stream.
Practice
Quiz
Which of the following phenomena is most closely related to diffraction?