simple past and past participle of close

Sealed, made inaccessible or impassable; not open.

(engineering, gas and liquid flow, of valve or damper) To be in a position preventing fluid from flowing.

(electricity, of a switch or circuit breaker) To be in a position allowing electricity to flow.

(of a store or business) Not operating or conducting trade.

Not public.

(topology, of a set) Having an open complement.

(mathematics, of a set) Such that its image under the specified operation is contained in it.

(mathematics, logic, of a formula) Lacking a free variable.

(graph theory, of a walk) Whose first and last vertices are the same, forming a closed loop.

(phonology) Formed by closing the mouth and nose passages completely, like the consonants /t/, /d/, and /p/.

(phonology) Having the sound cut off sharply by a following consonant, like the /ɪ/ in pin.

(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.