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closed (not comparable)

  1. Sealed, made inaccessible or impassable; not open.
    A closed and locked door prevented my escape.
    • 2005, Pamela J. Carter, ‎Susan Lewsen, Lippincott's Textbook for Nursing Assistants (page 277)
      When the top sheet, blanket, and bedspread of a closed bed are turned back, or fanfolded, the closed bed becomes an open bed, or a bed ready to receive a patient or resident.
  2. (engineering, gas and liquid flow, of valve or damper) To be in a position preventing fluid from flowing.
  3. (electricity, of a switch or circuit breaker) To be in a position allowing electricity to flow.
  4. (of a store or business) Not operating or conducting trade.
  5. Not public.
    closed source  a closed committee  The bill is being considered by the committee in closed session.
  6. (topology, of a set) Having an open complement.
  7. (mathematics, of a set) Such that its image under the specified operation is contained in it.
    The set of integers is closed under addition:  .
  8. (mathematics, logic, of a formula) Lacking a free variable.
  9. (graph theory, of a walk) Whose first and last vertices are the same, forming a closed loop.
  10. (phonology) Formed by closing the mouth and nose passages completely, like the consonants /t/, /d/, and /p/.
  11. (phonology) Having the sound cut off sharply by a following consonant, like the /ɪ/ in pin.
  12. (of a multi-word compound) Having component words joined together without spaces or hyphens; for example, timeslot as opposed to time slot or time-slot.



  • (also phonetics (of vowels, syllables)): open

Derived termsEdit


The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout § Translations.

See alsoEdit



  1. simple past tense and past participle of close





closed m (plural closedau)

  1. Alternative form of closet


Welsh mutation
radical soft nasal aspirate
closed glosed nghlosed chlosed
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.