Definition of "closed"

closed

/kləʊzd/

adjective
not comparable
1. Sealed, made inaccessible or impassable; not open.
  Quotations
  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.
  2005, Pamela J. Carter, Susan Lewsen, Lippincott's Textbook for Nursing Assistants, page 277
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.
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.
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.
verb
1. simple past and past participle of close