Meanings

opening and shutting

extraction of cubic root

to open wide (doors or windows)

curtain raising

opening (for that day's business; of a library, museum, cinema, etc.)

open-necked shirt

opening a port (seaport, airport, etc.)

in session

surrender of a castle

reclamation (e.g. of wasteland)

opening a business

extraction of square root

opening gate

opening and shutting

opening of a park (theme park, botanical garden etc.)

open circuit

opening (of a broadcasting station, post office, bureau, etc.)

opening a school

opening ceremony (of an event, show, etc.)

opening a new hospital, institution, temple, etc.