reference

reference — noun

1. an occasion when someone speaks or writes about a particular person, thing, or i

1.nounB1
Definition

an occasion when someone speaks or writes about a particular person, thing, or idea, often briefly in the middle of discussing something else.

Example

Ryan made a brief reference to the accident during his speech.

collocation: make a reference to

The article contained several references to the city's early history.

collocation: contain references to

Common collocations
  • make a reference to
  • contain references to
  • direct reference
  • brief reference
  • reference to something
Synonyms
  • mention

    less formal; used more in conversation than in writing

  • allusion

    suggests an indirect or subtle reference, not a direct one

  • comment

    focuses on expressing an opinion rather than simply naming something

2. a piece of text within a book or academic paper that tells the reader which earl

2.nounB2
Definition

a piece of text within a book or academic paper that tells the reader which earlier work supplied a given fact, idea, or quotation.

Example

Each chapter in Vivek's thesis ended with a full list of references.

collocation: list of references

Sofie checked the reference at the bottom of the page to find the original study.

Common collocations
  • list of references
  • include references
  • proper references
  • check references
  • reference section
Synonyms
  • citation

    more precise for an in-text credit; often used interchangeably in academic contexts

  • source

    broader — can mean the original work itself rather than the note that points to it

  • bibliography entry

    more formal; refers to the full listing at the end of a document

Usage Note

Commonly used in academic contexts. The plural form "references" often appears as a section heading at the end of a paper or book.

Common Mistakes

I put the reference at the end of the sentence.
I put the citation at the end of the sentence.
'citation' is more natural for an in-text note; 'reference' usually refers to the full entry in the bibliography.

3. a number or code used on a letter, form, or package that helps people find relat

3.nounB1
Definition

a number or code used on a letter, form, or package that helps people find related documents or quickly identify the subject being discussed.

Example

Please quote your customer reference number when you call.

collocation: reference number

The invoice arrived without a reference code, so the accounts team could not process it.

Common collocations
  • reference number
  • quote a reference
  • vacancy reference
  • customer reference
  • reference code
Synonyms
  • code

    more general; a reference is a specific type of code used for identification

  • file number

    specifically for internal organisational records

Usage Note

Frequently used in formal correspondence and business administration. Often appears as "Ref:" at the top of a letter.

4. a letter or statement that a person familiar with your background provides to su

4.nounB1
Definition

a letter or statement that a person familiar with your background provides to support your application for a job, a place at a school, or another opportunity.

Example

Tariq asked his former manager to write him a reference for the new job.

collocation: write someone a reference

Diya's university application included two references from her teachers.

collocation: include references

Common collocations
  • write a reference
  • provide a reference
  • ask for a reference
  • check references
  • character reference
Synonyms
  • recommendation

    slightly more informal; 'reference' is the standard term in British English

  • character reference

    specifically about personal qualities rather than professional skills

Usage Note

This sense can refer either to the letter itself or to the person who writes it. When someone is asked to be "a reference," they are agreeing to speak or write on your behalf.

Common Mistakes

I need a reference letter from my teacher.
I need a reference from my teacher.
'reference' alone is enough; 'reference letter' is redundant but acceptable in informal use.

5. the act of consulting a book, map, timetable, or similar resource to locate a fa

5.nounB2
Definition

the act of consulting a book, map, timetable, or similar resource to locate a fact or confirm a detail.

Example

Maeve kept a dictionary on her desk for easy reference while writing essays.

collocation: for easy reference

The manual is meant for quick reference and does not cover every situation.

collocation: quick reference

Common collocations
  • for reference
  • for easy reference
  • for quick reference
  • for future reference
  • make reference to
Synonyms
  • consultation

    more formal; suggests a more thorough look rather than a quick check

  • look-up

    informal; used for checking a single fact in a reference work

Usage Note

Often appears in fixed phrases like "for reference," "for future reference," and "quick reference." These phrases typically describe a book or resource kept nearby for occasional checking.

Idioms

in/with reference to

idiom

Used to indicate the subject of a conversation or piece of writing.

With reference to your email, we have updated the schedule.

Maya spoke in reference to the new project during the meeting.

reference — verb

reference — adjective

Word family

Synonym discussion

Sense: noun/1

All four words refer to something said or written about a topic, but they differ in directness and purpose. "Mention" is the most general and neutral — it means simply naming or touching on something without elaboration, as in "she made a passing mention of the budget." "Reference" suggests a more intentional pointing to something, often to support an argument or provide context. "Allusion" is indirect and assumes the audience will make the connection — for example, a speaker describing a long wait as "an Odyssey" makes an allusion to the ancient Greek epic. "Comment" and "remark" both involve expressing an opinion or observation; "remark" tends to be shorter and more casual ("a witty remark at dinner"), while "comment" can be longer and more analytical ("her comments on the proposal filled two pages"). Choose "reference" when you want to signal that the thing named is being used as a point of orientation or support, not just mentioned in passing.

mention ↗allusioncomment ↗remark ↗

Common collocations

Nouns

Adverbs

Phrases

  • with reference to
  • in reference to
  • for future reference
  • terms of reference
  • point of reference

Prepositions

Etymology

LatinFrenchEnglish

"Reference" entered English in the late 16th century from the Latin verb "referre," meaning "to carry back." It was formed by combining "re-" (back) and "ferre" (to carry). The word first appeared in English with the sense of "the act of referring something to someone for a decision" and later expanded to include the idea of looking back at a source of information. The meaning of a personal recommendation (noun sense 4) developed in the early 20th century as employers began formally requesting written assessments of job candidates.