› [C or U] COMMERCE an occasion when a new store, restaurant, etc. starts doing business: A week after the opening of the restaurant, cars were queueing up all along the street. Pre-tax profits rose, with new store openings running, on average, at three a month.a grand/an official opening The store is still committed to its grand opening in October. an opening ceremony → Compare closing noun › [U] COMMERCE the amount of time that a store, restaurant, etc. is open: One worker at the store criticized the problems caused by 24-hour opening. Our hours of opening are 8am to 6pm. Most stores have late opening in the run-up to Christmas. → Compare closing noun › [C] HR, WORKPLACE a job that is available: an opening for sth They have openings for carpenters and electricians. The company has about 50 job openings. › [C] the opportunity to do something: The failure of this project has left an opening in the market. › [C or U] STOCK MARKET, FINANCE the beginning of business for the day on a stock market, or the level of prices at the beginning of its business day: The deal was announced ahead of the stock market opening.a strong/weak opening A weak opening on the US markets intensified London selling. → Compare closing noun › [S] (also opening-up) COMMERCE a situation in which a country allows more foreign trade and investment than it did before: opening to sth Since China's opening to the outside world in 1978, the market economy system has been almost entirely established.opening of sth It is hoped that the agreement will pave the way for an opening of American borders. › [S] (also opening-up) COMMERCE a situation in which a country makes jobs, markets, etc. available to more people than before: the opening of sth Because of the opening of electric power markets in the US, many new opportunities presented themselves closer to home.