English Reference

Word

quarantine

Phoneticsquar·an·tine, stress on the first syllable

US/ˈkwɔɹənˌtin/

UK/kwˈɒɹɑːntˌiːn/

Definitions

01medical isolation

B2 · Upper Intermediate Uncountable noun Medicine

n. a period of time when people, animals, or plants are kept separate to prevent a disease from spreading.

n. a state, period, or place of isolation for people or animals that have arrived from elsewhere or been exposed to infectious disease.

“The dog had to stay in quarantine for six months before it could enter the country.”

“Public health officials mandated a strict fourteen-day quarantine for all passengers arriving from regions where the virus was endemic.”

02to isolate for health

B2 · Upper Intermediate Medicine

v. to keep a person or animal away from others so they do not spread a disease.

v. to impose isolation on a person, animal, or object to prevent the spread of infection; can be used transitively or intransitively.

“If you feel sick, you should quarantine at home to protect your coworkers.”

“The hospital staff moved quickly to quarantine the affected ward after three patients tested positive for the highly contagious strain.”

Synonyms

Antonyms

03computing

B2 · Upper Intermediate Uncountable noun Computing

n. a safe place on a computer where dangerous files are kept so they cannot cause harm.

n. the isolation of a file, program, or system to prevent a computer virus or malware from affecting other data.

“My antivirus software put the suspicious attachment into quarantine.”

“The system administrator placed the infected server in quarantine to prevent the ransomware from encrypting the rest of the corporate network.”

Synonyms

sandboxingisolation

04historical 40-day period

C2 · Proficiency Countable noun Archaic

n. a period of forty days, originally used for the time a ship had to wait before landing.

n. a period of forty days; historically referring to the duration a ship suspected of carrying plague was detained in port.

“In the past, a quarantine lasted exactly forty days to ensure no one on the ship was sick.”

“The term derives from the Italian 'quaranta giorni', referring to the forty-day quarantine enforced by the Venetian authorities during the Black Death.”

Collocations

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

Verb

01. impose a quarantine

“The government decided to impose a quarantine to prevent the virus from spreading to neighboring cities.”

verb + noun

02. lift the quarantine

“Health officials finally lifted the quarantine after no new cases were reported for two weeks.”

verb + noun

03. place the travelers in quarantine

“Authorities had to place the travelers in quarantine until their test results were confirmed.”

verb + noun + prep + noun

Adjective

04. mandatory quarantine

“All international arrivals are subject to a mandatory quarantine at a designated hotel.”

adj + noun

05. strict quarantine

“The crew had to follow a strict quarantine for fourteen days before they could leave the ship.”

adj + noun

Noun

06. quarantine facility

“The local gymnasium was converted into a temporary quarantine facility for the infected patients.”

noun + noun

07. quarantine period

“The standard quarantine period for this specific illness is ten days.”

noun + noun

Preposition

08. in quarantine

“She spent her birthday in quarantine, so her friends sent her gifts through the mail.”

prep + noun

Real-World Examples

“Ten people who came into contact with a man who died of Ebola in Kenya have been quarantined, health officials in the East African nation say.”
BBC News 7 Oct 2026
“Kimambo underlined the importance of quarantining so that contacts can be monitored and quickly tested should they develop symptoms.”
UN News 7 Oct 2026
“Strict quarantine measures have been imposed at the research centre in the city of Irkutsk and in several neighbouring hospitals.”
The Guardian 6 Oct 2026
“There is no need to quarantine, but even vaccinated people should watch for symptoms of disease.”
The Conversation 15 Sept 2026

Etymology

The word traces its path from Latin quadrāgintā ("four tens, 40") through a series of linguistic contortions. Medieval Latin quarentena and quarentīna ("40-day period, Lent") appear to have formed via a proposed Late Latin construction quaranta + -ēna, a distributive adjective pattern. By Middle English, the term had arrived as quarentine, and via Norman quarenteine and French quarenteine, it entered English. Italian quarantina preserves the same root, its etymological spine intact from quadrāgintā to quaranta.

In French political usage, the term’s meaning shifted from a religious observance to a legal measure. The calque quarantaine emerged after Louis IX’s edicts, applying the 40-day concept to political exclusions. This usage resurfaced in 1937 when Roosevelt’s administration invoked the term to describe its severance of relations with the Axis powers. A decade later, in 1962, Kennedy’s administration applied the same terminology to the Cuban missile crisis, lending the word a second life in diplomatic parlance.

The term’s journey from Lent to Latin America survived without altering its numerical core. Quarantena remained tied to 40, whether days, years, or political standoffs. The Axis and Cuba found themselves in the same grammatical boat as Lent and quadrāgintā — all bound to the same unchanging number.

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

Domains

ComputingLawMedicineMythologyPolitics

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.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL 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: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
Frequency
Frequent
Level
B2 · Upper IntermediateOxford
Updated

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English Reference