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open sentence in mathematics education, a simple mathematical equation or inequality in which one quantity is unknown, such as 2 + ? = 5.
open sesame in The Arabian Nights, the magic words that open the door of the robbers' den. [2 definitions]
open shop a business or factory in which a union represents the workers, although union membership is not necessary for employment.
open stock a type of merchandising in which single pieces of goods usu. sold in sets, such as flatware, glassware, or china, are kept in stock to be sold individually as replacement or supplements.
open-toed of shoes, having an opening or being open at the toe.
open up (informal) to speak revealingly, esp. of oneself. [4 definitions]
openwork anything, such as a craft object or an architectural element, that is perforated by many openings, usu. in a decorative pattern.
opera1 a dramatic work set to music, with an accompaniment by an orchestra. [3 definitions]
opera2 a pl. of opus.
operable capable of being put into operation; functional. [2 definitions]
opéra bouffe a comic, farcical, or satirical opera.
opéra comique opera with spoken dialogue in addition to musical solos and ensembles.
opera glasses a small pair of low-power binoculars, used to get a better view of stage performers.
opera hat a man's collapsible top hat.
opera house a theater, esp. one in which operas are performed.
operant having some effect; operating. [4 definitions]
opera seria eighteenth-century Italian dramatic opera, characterized by frequent arias and classical or mythological themes.
operate to function in a correct or effective manner, as a machine. [5 definitions]
operatic characteristic of or pertaining to the opera. [3 definitions]
operating system in computing, the software that controls and manages all aspects of a computer's operation, including the execution of application programs; the functioning of computer hardware; data input and output; the timing of and allocation of resources to the execution of multiple, simultaneous tasks; the physical storage and location of data; and computer security. Users interact with the operating system though a graphical user interface.
operation the act or process of operating or functioning. [5 definitions]