dispersion

dispersion — noun

1. the movement of people, animals, or things away from a central point, so that th

1.nounB2
Definition

the movement of people, animals, or things away from a central point, so that they spread out over a larger area

Example

The dispersion of the crowd after the concert took less than fifteen minutes.

dispersion of + crowd/group

Scientists measured the dispersion of pollen from the sunflower field across nearby farmland.

dispersion of + natural particles

Common collocations
  • population dispersion
  • seed dispersion
  • crowd dispersion
  • urban dispersion
  • wide dispersion
  • rapid dispersion
Synonyms
  • dispersal

    more common for living things such as animals or seeds; otherwise very similar

  • scattering

    less formal; suggests random or unplanned spreading

  • diffusion

    focuses on gradual mixing through a medium, often used in science

  • distribution

    broader term; implies an arranged or measured spread rather than chaotic scattering

Antonyms
  • concentration

    the act of gathering things together in one place

  • collection

    bringing items or people into a single group

Grammar Patterns

dispersion of + noun phrase

Usage Note

Uncountable. 'Dispersal' is more common for living organisms, while 'dispersion' also covers particles and physical phenomena. Frequently used in academic and formal writing.

Common Mistakes

There was a wide dispersion of the seeds by the wind.
The seeds were widely dispersed by the wind.
'dispersion' as a noun is uncountable; do not use 'a' before it.
The dispersion of the group happened very quick.
The dispersion of the group happened very quickly.
use an adverb, not an adjective, to modify the verb.

2. the effect produced when white light is split into its different colours — for e

2.nounC1
Definition

the effect produced when white light is split into its different colours — for example, when it passes through a prism, water droplets, or similar objects

Example

A glass prism demonstrates the dispersion of white light into a full spectrum of colours.

prism demonstrates dispersion of light

Lakshmi's physics project explained how dispersion causes the colours in a rainbow to appear.

Common collocations
  • chromatic dispersion
  • light dispersion
  • dispersion of light
  • refractive dispersion
  • modal dispersion
Synonyms
Antonyms
  • convergence

    the act of rays coming together rather than separating

Grammar Patterns

dispersion of + light/white light

Usage Note

Uncountable. A specialised term in physics and optics. Do not confuse with 'refraction' (the bending of light) or 'diffraction' (the spreading of waves around obstacles) — dispersion specifically refers to the separation into colours.

Common Mistakes

A rainbow is caused by the refraction of sunlight in raindrops.
A rainbow is caused by the dispersion of sunlight in raindrops.
refraction is the bending; dispersion is the splitting into colours.

Word family

  • disperse
    verbB2
  • dispersed
    adjectiveB2
  • dispersal
    nounC1
  • dispersive
    adjectiveC1

Synonym discussion

Sense: noun/1

Dispersion, dispersal, scattering, diffusion and distribution all describe things moving or being spread out, but they differ in formality, domain and connotation. 'Dispersion' (formal, uncountable) fits both living and non-living subjects — people, seeds or light. 'Dispersal' is preferred for living organisms, especially in ecology ('seed dispersal by birds'). 'Scattering' is less formal and suggests randomness ('the scattering of ashes'). 'Diffusion' implies gradual, passive spread through a medium, often in physics or chemistry ('gas diffusion'). 'Distribution' is neutral and suggests an arranged or measured spread ('the distribution of aid'). While 'dispersion of a crowd' and 'dispersal of a crowd' are interchangeable, only 'dispersion' works for light physics. In social contexts, 'dispersion of refugees' carries a formal, statistical tone; 'dispersal of refugees' emphasises human movement.

dispersalscatteringdiffusion ↗distribution ↗

Common collocations

Nouns

  • rate of dispersion
  • pattern of dispersion
  • degree of dispersion
  • point of dispersion

Phrases

  • cause dispersion
  • lead to dispersion
  • result in dispersion
  • measure dispersion

Prepositions

  • dispersion of

Etymology

LatinFrenchEnglish

Dispersion entered English from Old French 'dispersion', which came from Latin 'dispersio' ('scattering, spreading'), based on the verb 'dispergere' ('to scatter abroad'). 'Dispergere' itself was formed from 'dis-' (meaning 'apart, in different directions') and 'spargere' ('to scatter, strew'). The physics sense describing the separation of light into colours developed in the late 1600s, following Newton's prism experiments.