oxidation

oxidation — noun

1. the chemical process in which a substance reacts with oxygen, which changes how

1.nounB2
Definition

the chemical process in which a substance reacts with oxygen, which changes how the substance looks or behaves — for example, when iron becomes reddish rust or when the cut surface of an apple turns brown.

Example

The old iron gate slowly turned into reddish dust because of oxidation.

oxidation cause of visible change (rusting)

Soraya noticed oxidation on her grandmother's silver spoons, which turned dark over time.

Common collocations
  • undergo oxidation
  • cause oxidation
  • prevent oxidation
  • slow down oxidation
  • speed up oxidation
  • oxidation process
  • oxidation reaction
  • oxidation of [substance]
Synonyms
  • rusting

    specifically the oxidation of iron or steel, producing reddish-brown rust

  • corrosion

    a broader term for material breakdown, often caused by oxidation but also by other chemical reactions

  • tarnishing

    mild surface oxidation that causes metals such as silver to darken or lose shine

Antonyms
  • reduction

    the opposite chemical reaction, where a substance gains electrons

Grammar Patterns

oxidation + of + noun phrase

Usage Note

Common in everyday contexts beyond the chemistry lab: rusting (iron), tarnishing (silver), browning (fruit), and oil turning rancid are all familiar forms of oxidation. The opposite chemical process is called reduction.

Common Mistakes

The apple turned brown because of rust.
The apple turned brown because of oxidation.
Rust is the specific result of iron oxidation; fruit browning is a different form of the same chemical process.

Word family

  • oxidize
    verbB2
  • oxidization
    nounC1
  • oxidative
    adjectiveC1
  • oxide
    nounB2
  • oxidizer
    nounC1

Synonym discussion

Sense: noun/1

Oxidation is the broad chemical process of a substance reacting with oxygen. Rusting refers specifically to the oxidation of iron or steel, producing reddish-brown rust that flakes away. Corrosion is a wider term that covers any gradual destruction of materials — it is often caused by oxidation (especially for metals), but can also result from other chemical or electrochemical reactions. Tarnishing is a milder form of surface oxidation that affects metals like silver and copper, causing them to darken or lose their shine without being structurally destroyed. For example, a car body suffers from rusting, a silver necklace develops tarnishing, and old pipes undergo corrosion from years of oxidation combined with moisture in the soil.

rustingcorrosion ↗tarnishing

Common collocations

Nouns

  • oxidation process
  • oxidation reaction
  • oxidation state
  • oxidation rate
  • oxidation product

Adverbs

Prepositions

  • oxidation of
  • oxidation by
  • oxidation from

Etymology

GreekFrenchEnglish

Oxidation comes from the French word 'oxydation', formed from 'oxyde' (oxide) and the suffix '-ation'. French chemist Antoine Lavoisier coined the term in the late 1700s after discovering that oxygen is the element that combines with other substances during burning and rusting. The word 'oxygen' itself comes from Greek roots 'oxys' (sharp, acid) and 'genēs' (born), because early chemists believed oxygen was essential for forming acids.