English Reference

Word

vector

Phoneticsvec·tor, stress on the first syllable

US/ˈvɛktɝ/

UK/vˈɛktɐ/

Definitions

01math and physics

C1 · Advanced Countable noun Mathematics Technical

n. a quantity that has both a size and a specific direction.

n. a quantity possessing both magnitude and direction, represented geometrically by an arrow.

“The teacher asked us to calculate the velocity vector of the moving car.”

“In classical mechanics, force is treated as a vector because its effect depends on both its strength and the direction in which it is applied.”

Usage

Often used with 'magnitude' and 'direction'.

Synonyms

Antonyms

02biology and medicine

C1 · Advanced Countable noun Medicine Technical

n. an insect or animal that carries a disease from one person to another.

n. an organism, typically a biting insect or tick, that transmits a pathogen from one host to another.

“Mosquitoes are the primary vector for spreading malaria in this region.”

“Public health officials focused on eliminating stagnant water to reduce the population of the biological vector responsible for the outbreak.”

Usage

Commonly used in the phrase 'disease vector'.

03computing

C2 · Proficiency Countable noun Computing Technical

n. a list of data items that can change in size.

n. a data structure representing a one-dimensional array that can be dynamically resized.

“The programmer used a vector to store the list of user names.”

“The algorithm's efficiency improved significantly after we replaced the static array with a dynamic vector to handle fluctuating data loads.”

Synonyms

04aviation

C2 · Proficiency Science Technical

v. to give a pilot directions to fly a certain course.

v. to guide an aircraft in a particular direction using radio instructions.

“The air traffic controller had to vector the plane around the storm.”

“The pilot requested that the tower vector them toward the secondary runway due to the increasing crosswinds.”

Synonyms

Real-World Examples

“The engines are primarily designed for orbit-raising, but they’re also suitable for attitude control because they can vector their thrust with a two-axis gimbal.”
Ars Technica 1 Aug 2026
“Mosquito vector research , for comparison, began in 1897.”
Smithsonian Magazine 31 Jul 2026

Etymology

Learned borrowing from Latin vector (“carrier, transporter”), from vehō (“to carry, transport, bear”), also ultimately the root of English vehicle. The “person or entity that passes along an urban legend or other meme” sense derives from the disease sense. The mathematics sense was coined by Irish mathematician and astronomer William Rowan Hamilton in 1846.

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

Related words

Domains

AviationBiologyComputingHistoryMathematicsPhysicsProgrammingPsychologySociology

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 · Advanced
Updated

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English Reference