purification

purification — noun

1. The process of removing harmful or unwanted substances from something such as wa

1.nounB2
Definition

The process of removing harmful or unwanted substances from something such as water, air, or food, so that it becomes clean and safe.

Example

The city's water treatment plant runs a three-stage purification process before supplying water to homes.

purification process

After the chemical spill, the river purification took over a year with special filtering equipment.

purification of [the river]

Common collocations
  • water purification
  • air purification
  • purification system
  • purification process
  • purification method
  • purification plant
Synonyms
  • cleansing

    more general and can apply to both physical and spiritual cleaning; less technical than purification

  • filtration

    specifically refers to passing through a filter; a narrower process than full purification

  • decontamination

    focuses on removing dangerous contaminants; more urgent and serious in tone

Antonyms

Grammar Patterns

purification + of [something]

purification + [method/system/process]

Usage Note

Often used with nouns that specify what is being cleaned: water purification, air purification, water purification system. The verb form is purify.

Common Mistakes

The purification of the water happens inside this machine.
The water is purified inside this machine.
The noun form is correct but can sound unnatural in everyday speech; the verb form is often preferred in casual contexts.

2. In some religious traditions, a ceremony or set of actions that removes the bad

2.nounB2
Definition

In some religious traditions, a ceremony or set of actions that removes the bad spiritual effects of breaking a moral or religious law, restoring a person's purity.

Example

In many cultures, water purification rituals are performed before important religious ceremonies.

purification rituals

After confessing his mistakes, Theo took part in a traditional purification ceremony at the temple.

Common collocations
  • spiritual purification
  • purification ritual
  • purification ceremony
  • purification rite
  • purification practice
Synonyms
  • absolution

    specifically the formal release from guilt or sin in Christian traditions; narrower than purification

  • atonement

    the action of making amends for wrongdoing, often through sacrifice or penance; a broader concept

  • cleansing

    used in both spiritual and physical contexts; less formal than purification

Antonyms
  • defilement

    the state of being made spiritually unclean or impure

Grammar Patterns

purification + ritual/ceremony/rite

purification + of [the soul/spirit/person]

Usage Note

This sense is specific to religious or spiritual contexts. It is different from sense 1, which refers to physical or chemical cleaning. The word purification here is almost always uncountable and preceded by an adjective or noun that indicates the religious tradition.

3. The scientific or industrial process that separates a concentrated, pure version

3.nounC1
Definition

The scientific or industrial process that separates a concentrated, pure version of a specific material from a mixture or raw source containing other substances.

Example

The purification of crude oil produces gasoline, diesel, and many other useful products.

purification of crude oil

In the lab, the protein sample purification required three rounds of filtering and testing.

purification of the protein sample

Common collocations
  • chemical purification
  • purification technique
  • purification method
  • purification of [substance]
  • protein purification
  • silicon purification
Synonyms
  • refining

    nearly identical; refining is more common for metals and oil, while purification is broader

  • distillation

    a specific technique of purification that uses heating and condensation; narrower in meaning

  • extraction

    the act of taking something out; purification implies extraction plus removal of impurities

Antonyms
  • adulteration

    the process of making something impure by adding unwanted substances

Grammar Patterns

purification + of [substance]

purification + process/technique/method

Usage Note

Typically used in scientific, industrial, or laboratory contexts. Unlike sense 1 (physical cleansing for safety), this sense focuses on obtaining a concentrated, usable pure substance from a mixture. Frequent in chemistry and manufacturing.

Word family

  • purify
    verbB2
  • pure
    adjectiveA2
  • purity
    nounB2
  • impure
    adjectiveB2
  • impurity
    nounB2
  • purist
    nounC1
  • purifier
    nounB2

Synonym discussion

Sense: noun/1

Purification is the broadest term, covering any process that removes unwanted substances to make something pure — from water treatment to air cleaning. Cleansing is more general and less technical; it can refer to washing the body or cleaning a surface, and also has spiritual uses that purification shares only in sense 2. Filtration is a specific method — it forces a liquid or gas through a filter to separate solids — so it is narrower than purification. Decontamination is the most urgent of the four, focusing specifically on the removal of dangerous contaminants such as radiation, poison, or bacteria. For everyday contexts, use cleansing for personal hygiene, filtration for mechanical separation, and purification when the goal is complete removal of all impurities. For example: 'The cleansing of the wound took five minutes'; 'The water filtration system removes sand and dirt'; 'The decontamination team wore full protective suits.'

purification ↗cleansingfiltration ↗decontamination

Common collocations

Nouns

Phrases

  • purification and filtration
  • purification and refinement

Prepositions

  • purification by [method]
  • purification through [process]

Etymology

LatinOld FrenchEnglish

The word purification comes from Latin purificare, which is formed from purus meaning 'pure, clean' and facere meaning 'to make or do'. It entered English through Old French purifier and later took its current form as the noun purification. The concept of 'making pure' has been used for both physical cleaning and spiritual cleansing since the word first appeared in English around the 1400s.