Sector Meaning, Definition, and Synonyms

Sector is a noun with several distinct meanings. It can refer to a part of life or activity, a section of society or the economy, a geometric figure, a military area, a measuring tool, or a storage unit in computing. The most common everyday sense is a part of a larger whole, especially in society or the economy.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-11-03. AI assessment; not a guarantee of accuracy.

Pronunciation

AI-generated pronunciation audio (OpenAI).

Accent: General American English

IPA: /ˈsɛktɚ/

Easy pronunciation: SEK-ter (approximate spelling).

Stress: Stress is on the first syllable: SEK.

Use this noun for a part of the economy or society, as in the public sector.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-11-03. AI assessment; not a guarantee of accuracy.

Sector Meaning

a part of the economy or society

Part of speech: noun

Definition: a social group or part of society or the economy

Example: The healthcare sector is growing quickly.

Synonyms for this meaning:

sphere — Can work for the broader idea of an area of activity, but it is less specific than sector and not always interchangeable.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-11-03. AI assessment; not a guarantee of accuracy.

Other Meanings of Sector

Meaning 2

a particular area of life or activity

Part of speech: noun

Definition: a particular aspect of life or activity

Example: He was struggling in an important sector of his life.

Synonyms for this meaning:

sphere — Works well here in the sense of an area or field of activity.

Meaning 3

a shape like a slice of a circle

Part of speech: noun

Definition: a plane figure bounded by two radii and the included arc of a circle

Example: A pizza slice is a rough visual example of a circle sector.

Meaning 4

a section of a military area

Part of speech: noun

Definition: a portion of a military position

Example: The troops were assigned to the northern sector.

Meaning 5

a hinged measuring tool with two arms

Part of speech: noun

Definition: measuring instrument consisting of two graduated arms hinged at one end

Example: The navigator used a sector to measure angles.

Meaning 6

a small unit of data storage on a disk

Part of speech: noun

Definition: the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes

Example: The file was written to a damaged sector on the drive.

Reviewed with OpenAI Decisions. Assessment: uncertain — manual review needed. Checked: 2026-11-03. AI assessment; not a guarantee of accuracy.

Sector Synonyms

Similar Meaning

sphere

a particular aspect of life or activity

sphere

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-11-03. AI assessment; not a guarantee of accuracy.

Common Mistakes

Do not confuse sector meaning a part of society or the economy with sector meaning a geometric shape or a storage unit.
Sphere is sometimes similar, but it is broader and not always a perfect substitute.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-11-03. AI assessment; not a guarantee of accuracy.

Frequently Asked Questions

What does sector mean?

Sector usually means a part of society, the economy, or another area of activity. It can also refer to a circular shape, a military area, a measuring tool, or a unit of data storage.

What is sector a synonym for?

In its everyday sense, sector is closest to words like sphere when it means an area of activity. In economics, it often means a part of the economy or society.

Is sphere a synonym for sector?

Sometimes. Sphere can work when sector means an area of activity, but it is broader and not always interchangeable.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-11-03. AI assessment; not a guarantee of accuracy.