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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]
operational being used or capable of being used; functional. [2 definitions]
operationalize to put into operation; make operational.
operations research the systematic mathematical or scientific analysis of an operation, policy, or process to improve its effectiveness or efficiency.
operative one who is employed in a particular kind of work, esp. in industry. [6 definitions]
operator one who controls functions, operations, or activities, as of machines or businesses. [4 definitions]
operatorless combined form of operator.
operculum in biology, an organ or organ part that serves as a lid, flap, or cover.
operetta a short light, usu. humorous opera, often with dialogue that is spoken as well as sung.
ophidian designating the biological suborder that comprises snakes. [2 definitions]
ophiolatry the attribution of divine power to snakes; worship of snakes.
ophiology the branch of zoology that deals with snakes.
ophthalmia inflammation of one or more parts of the eye, esp. the conjunctiva.
ophthalmic of or concerning the eye.
ophthalmo- eye.