English Reference

Word

dependency

Phoneticsde·pen·den·cy, stress on the second syllable

US/dɪˈpɛndənsi/

UK/dɪpˈɛndənsi/

Definitions

01reliance on something

B2 · Upper Intermediate Uncountable noun

n. a situation where you need someone or something to help you or to work correctly.

n. the state of being dependent on or controlled by someone or something else.

“The small island's dependency on tourism makes it vulnerable during the winter months.”

“The economic dependency of the satellite states on the central government created a fragile system that collapsed once subsidies were withdrawn.”

Synonyms

reliancesubordination

02addiction

B2 · Upper Intermediate Uncountable noun Medicine

n. a physical or mental need for a drug, alcohol, or a specific habit.

n. a state of physiological or psychological need for a habit-forming substance.

“He sought medical help to overcome his dependency on sleeping pills.”

“Long-term chemical dependency often requires a combination of clinical detoxification and sustained psychological support to prevent relapse.”

03computing requirement

C1 · Advanced Countable noun Computing Technical

n. a piece of software or a file that another program needs in order to run.

n. a software component, library, or module that is required by another piece of software to function correctly.

“Before you can install the game, you must download a few dependencies first.”

“The build failed because the compiler could not resolve a version conflict between two shared dependencies in the project manifest.”

Usage

Often used in the plural when referring to a list of required libraries.

04a territory

C1 · Advanced Countable noun Formal

n. a country or area that is controlled by another, more powerful country.

n. a territory or colony that is subject to the jurisdiction of an external power but not formally annexed.

“The region remains a British overseas dependency with its own local government.”

“The constitutional status of the dependency was debated in the international court, as the local population sought greater self-determination.”

Antonyms

sovereign state

Real-World Examples

“Long-term use of the drugs can also result in dependency; users find they rely on it for any social situation.”
BBC News 18 Aug 2026
“Every week, Annette Deao, a drug dependency counselor, sits in the county jail and offers incarcerated people in rural Ohio a chance at recovery.”
The Guardian 15 Aug 2026

Etymology

From dependent + -cy or dependence + -y or depend + -ency.

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

Word family

ADJECTIVE

Domains

ComputingProgramming

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 Intermediate
Updated

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English Reference