mechanism

mechanism — noun

1. the collection of physical pieces inside a device that move or interact so that

1.nounB2
Definition

the collection of physical pieces inside a device that move or interact so that the device performs its intended function — for instance, the gears and springs that allow a clock to show the correct time.

Example

Karim studied the mechanism inside the grandfather clock to understand how the chimes work.

mechanism inside + device — typical prepositional pattern

A faulty locking mechanism on Tamar's suitcase caused her bag to open during the flight.

collocation: locking mechanism

Common collocations
  • locking mechanism
  • trigger mechanism
  • winding mechanism
  • firing mechanism
  • release mechanism
  • safety mechanism
  • steering mechanism
Synonyms
  • machinery

    refers to all moving parts collectively rather than one sub-system

  • workings

    informal; describes how the parts function together

  • apparatus

    more formal; often used for scientific or technical equipment

Grammar Patterns

mechanism + that + verb

Usage Note

Frequently used with a compound noun that names the type of part: 'locking mechanism', 'trigger mechanism', 'steering mechanism'. The specific device is usually mentioned as a possessor ('the mechanism of the door handle') or in a compound ('the door-handle mechanism').

Common Mistakes

I bought a new mechanism for my car.
I bought a new part for my car.
'Mechanism' refers to a whole sub-system of moving parts, not a single replacement component.

2. a planned set of rules, steps, or procedures within an organisation or system th

2.nounB2
Definition

a planned set of rules, steps, or procedures within an organisation or system that is designed to produce a particular outcome — for example, a formal process that lets customers complain and receive a response.

Example

Élise used the company's internal review mechanism to appeal her manager's decision.

mechanism for + gerund — purpose structure

The school's disciplinary mechanism requires a meeting with parents before any student is suspended.

collocation: disciplinary mechanism

Common collocations
  • voting mechanism
  • feedback mechanism
  • pricing mechanism
  • disciplinary mechanism
  • complaint mechanism
  • control mechanism
  • review mechanism
  • adjustment mechanism
Synonyms
  • system

    broader; can refer to any organised set of parts or rules, not necessarily goal-directed

  • method

    more deliberate and step-by-step; less automatic than a mechanism

  • process

    emphasises the sequence of changes or actions over time

  • procedure

    more formal and rule-bound; often written down in official guidelines

Grammar Patterns

mechanism for + noun/gerund

mechanism + that + verb

mechanism of + noun

Usage Note

Common in academic, business, and political writing. The noun or gerund after 'for' explains the purpose of the mechanism ('a mechanism for resolving disputes'). The plural form is rarer and usually appears in technical or comparative contexts ('comparing different pricing mechanisms').

Common Mistakes

We need a mechanism to open this jar.
We need a tool to open this jar.
'Mechanism' as an abstract system does not fit a concrete, one-off physical task.

3. an unconscious pattern of thoughts or reactions that the mind uses to protect it

3.nounB2
Definition

an unconscious pattern of thoughts or reactions that the mind uses to protect itself from emotional pain, anxiety, or overwhelming situations — for example, avoiding a painful memory by staying very busy at work.

Example

Nkechi's habit of staying cheerful during hardship was her natural coping mechanism.

collocation: coping mechanism

Sari developed a defence mechanism of making jokes whenever anyone asked about her old job.

collocation: defence mechanism

Common collocations
  • coping mechanism
  • defence mechanism
  • defense mechanism
  • psychological mechanism
  • survival mechanism
Synonyms
  • coping strategy

    broader; may be conscious or unconscious, not necessarily defensive

  • defence

    shorter form; less clinical, more general

Grammar Patterns

coping mechanism

defence/defense mechanism

psychological mechanism

Usage Note

Most common in psychology and self-help contexts. The spelling 'defence mechanism' is British English; 'defense mechanism' is American English. 'Coping mechanism' is broader and can refer to both conscious and unconscious strategies, not just defensive ones.

Common Mistakes

His defence mechanism made him jump out of the way of the car.
His survival instinct made him jump out of the way of the car.
'Defence mechanism' refers to mental/emotional protection, not physical reflexes.

Word family

Synonym discussion

Sense: noun/2

Mechanism suggests a structured, often automatic or built-in way of achieving a result, as though the method is part of a larger design. System is the broadest of the four — it can mean any organised set of parts or rules, from a railway system to a political one. Method emphasises a deliberate, step-by-step technique chosen by a person. Process highlights a sequence of events or changes over time rather than a fixed plan. Procedure is the most formal and rule-bound, often found in official or workplace guidelines. For example, a company may have a complaint mechanism (the built-in channel), a complaint process (what happens step by step), and a complaint procedure (the written rulebook employees must follow).

system ↗method ↗process ↗procedure ↗

Common collocations

Nouns

Adverbs

Phrases

  • mechanism for + noun/gerund
  • mechanism of + noun
  • mechanism by which + clause

Prepositions

Etymology

GreekLatinFrenchEnglish

From Greek 'mēkhanē' (a device, an instrument) through Latin 'mechanicus' (relating to machines), then French 'mécanisme' and into English in the 17th century. Originally referred only to physical machine parts, then expanded in the 19th and 20th centuries to cover abstract systems, biological processes, and psychological patterns.