English Reference

Word

buffer

Phoneticsbuf·fer, stress on the first syllable

US/ˈbəfɝ/

UK/bˈʌfɐ/

Definitions

01a protective barrier

B2 · Upper Intermediate Countable noun

n. something that helps protect against harm or reduces the impact of a bad situation.

n. a person or thing that reduces a shock or forms a barrier between incompatible or antagonistic forces.

“The savings account acted as a buffer when he suddenly lost his job.”

“The neutral zone was established to serve as a buffer between the two warring factions, preventing direct military engagement while negotiations continued.”

02computing storage

B2 · Upper Intermediate Countable noun Computing

n. a temporary storage area for data, often used when streaming video or moving files.

n. a region of physical memory used to temporarily store data while it is being moved from one place to another.

“The video kept pausing because the buffer was empty due to a slow internet connection.”

“The application allocates a specific buffer to handle incoming network packets, ensuring that data is not lost during periods of high traffic.”

Synonyms

03chemical balance

C1 · Advanced Countable noun Science Technical

n. a substance that keeps a liquid's acidity at a steady level.

n. a solution that resists changes in pH when acid or alkali is added to it.

“Blood contains a natural buffer to keep its pH level safe for the body.”

“The researcher added a phosphate buffer to the solution to maintain a constant environment for the enzyme reaction.”

Synonyms

04an old man

C2 · Proficiency Countable noun British English · Informal

n. a slightly silly but kind man, usually an older person.

n. a somewhat foolish or old-fashioned man, typically used in a mildly affectionate way.

“He is a bit of an old buffer, but he tells wonderful stories about the war.”

“The club was filled with elderly buffers dozing in leather armchairs and grumbling about the state of modern politics.”

Synonyms

05to protect or soften

B2 · Upper Intermediate

v. to reduce the bad effect of something or to protect one thing from another.

v. to lessen or moderate the impact of something; to act as a protective barrier.

“The thick walls helped to buffer the noise from the busy street outside.”

“The government introduced new subsidies to buffer the agricultural sector against the sudden drop in global commodity prices.”

06to load data

B1 · Intermediate Computing

v. when a computer or app stores data temporarily before playing it.

v. to store data in a temporary memory area; often used intransitively to describe a media player loading content.

“Wait a moment while the movie buffers so it doesn't stop later.”

“The system is designed to buffer the stream automatically, adjusting the quality based on the user's available bandwidth.”

Synonyms

loadpre-load

Collocations

Common phrases and expressions where native English speakers use the word “buffer” in context.

Verb

01. act as a buffer

“The small neutral country acted as a buffer between the two warring superpowers.”

verb + prep + noun

02. provide a buffer

“Maintaining a high level of savings provides a buffer against unexpected financial shocks.”

verb + noun

Adjective

03. financial buffer

“The company built up a significant financial buffer to survive the economic downturn.”

adj + noun

04. protective buffer

“The trees were planted to create a protective buffer against the harsh coastal winds.”

adj + noun

Noun

05. buffer state

“Historically, Poland often functioned as a buffer state between larger European powers.”

noun + noun

06. buffer zone

“The UN established a buffer zone to keep the opposing military forces apart.”

noun + noun

Preposition

07. as a buffer against

“The new regulations were designed as a buffer against future market volatility.”

prep + noun + prep

Real-World Examples

“The IDF says it will continue to remove threats to Israeli citizens and soldiers operating in the security zone - the 10km-deep military buffer in southern Lebanon occupied by Israel.”
BBC News 15 Aug 2026
“These groundwater stores "respond more slowly to changes in the climate than rivers, which is why they provide a useful buffer during periods of drought", said Prof Alan MacDonald of the British Geological Survey.”
BBC News 7 Aug 2026

Etymology

From buff + -er.

Agent noun from obsolete verb buff (“make a dull sound when struck”) (mid-16c.), from Old French buffe (“blow”). The “boatswain's mate” sense is said to be popularly explained by the mate being a “buffer”, that is intermediary, between officers and men, but various other explanations have also been proposed.

In reference to buff leather.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Word family

NOUN

buffer(C1)

Idioms

Domains

ChemistryComputingFinanceNauticalPoliticsProgramming

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.C1 AdvancedIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.7.0–8.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 5.0–5.595–113TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.945–990
Frequency
Frequent
Level
C1 · AdvancedOxford
Updated

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