English Reference
adjective · verb · noun

compact

adj. · v. · n.
US /ˈkɑmpækt/ com·pact UK spelling compacting, compacts

  1. 01 B1 Intermediate

    adj.small and designed to fit into a little space.

    adj.having all necessary features or parts fitting neatly into a small volume or space.

    Simple

    The new laptop is very compact and fits easily into my backpack.

    In context

    The architect designed a compact living area that managed to include a full kitchen and a workspace without feeling cramped.

    Usage

    Usually precedes the noun it describes.

    smallhandyspace saving
  2. 02 B2 Upper Intermediate

    adj.closely packed together or very solid.

    adj.closely and firmly packed together; having high density.

    Simple

    The snow was so compact that we could walk on top of it.

    In context

    The geologist explained that the compact layers of sedimentary rock had been formed over millions of years of intense pressure.

  3. 03 B2 Upper Intermediate

    v.to press something together so that it becomes smaller or harder.

    v.to exert pressure on a substance so that it becomes more dense or occupies less space.

    Simple

    The machine compacts the waste into small cubes for recycling.

    In context

    Before laying the foundation, the construction crew used heavy machinery to compact the soil and ensure a stable base for the building.

    Usage

    This is a transitive verb requiring a direct object.

  4. 04 C1 Advanced Formal Law

    n.a formal promise or agreement between two or more people or groups.

    n.a formal agreement or contract between different parties, often used in political or legal contexts.

    Simple

    The two nations signed a compact to protect the shared river.

    In context

    The Mayflower Compact served as an early social contract, establishing a rudimentary form of self-government for the settlers in the new colony.

    Usage

    Often used with the verb 'to sign' or 'to enter into'.

  5. 05 B2 Upper Intermediate

    n.a small case with a mirror and face powder that you carry in a bag.

    n.a small, portable case containing a mirror and cosmetic powder, typically designed for use in a handbag.

    Simple

    She took a small compact out of her purse to check her lipstick.

    In context

    The vintage silver compact was an heirloom passed down from her grandmother, still containing the original glass mirror.

    casevanity case

The compact, extremely distant red sources appear throughout the early universe, but their true nature has remained difficult to explain.

ScienceDaily· 17 Aug 2026

Ultimately, Smith argues, this process could yield a technology so compact that it will essentially disappear from the map of the cosmos.

The Guardian· 11 Aug 2026
This entry
Level C1 · Advanced
Frequency Common
Updated