English Reference

Word

inside

Phoneticsin·side, stress on the first syllable

/ˈɪnˌsaɪd/

Definitions

01within a space

A1 · Beginner

prep. in or into a room, building, or container.

prep. within the interior of a defined physical space or container.

“The keys are inside the small blue box on the shelf.”

“The documents were discovered inside a locked safe that had remained undisturbed in the basement for decades.”

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02within a time period

B1 · Intermediate

prep. happening before a certain amount of time has passed.

prep. within the duration of a specified period of time.

“The technician promised to fix the computer inside an hour.”

“The legal team managed to file the appeal inside the three-day window permitted by the court.”

Synonyms

withinin less than

03indoors

A2 · Elementary

adv. in or into a building.

adv. within or towards the interior of a building or enclosed structure.

“It started to rain, so the children ran inside to play.”

“Although the garden was beautiful, the humidity forced the guests to move the party inside where there was air conditioning.”

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04the interior

A2 · Elementary Countable noun

n. the inner part or side of something.

n. the internal part, surface, or space of an object or structure.

“The inside of the house was painted a bright white.”

“The architect focused on the inside of the cathedral, ensuring the vaulted ceilings would amplify the choir's voices.”

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05secret information

C1 · Advanced Uncountable noun Informal · Slang

n. special information that only people involved in a situation know.

n. privileged or confidential information known only to those within a specific group or organisation.

“He gave me the inside on why the manager really quit.”

“Journalists were desperate to get the inside on the merger before the official press release was issued tomorrow morning.”

Synonyms

06internal or privileged

B2 · Upper Intermediate

adj. relating to the inner part of something, or coming from within a group.

adj. pertaining to the interior; also used to describe a person or information originating from within an organisation.

“The police suspect it was an inside job because the alarm was turned off.”

“The company conducted an inside audit to identify inefficiencies before hiring external consultants for a broader review.”

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Etymology

From Middle English ynneside; equivalent to in- + side. Compare German Innenseite (“inside”), Danish inderside (“inside”), Swedish insida (“inside”), Dutch binnenzijde (“inside”), German Low German Binnensied, Binnersied (“inside”), Saterland Frisian Binnersiede (“inside”).

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

Word family

CONJUNCTION

PREPOSITION

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.A2 KeyIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.3.0–4.0TOEFL 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: 2.0–2.524–43TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.225–549
Frequency
Very common
Level
A2 · ElementaryOxford
Updated

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English Reference