Nouns in english starting with O

• opera comique — Noun – English ～ opera with a happy ending and in which some of the text is spoken
• opera cloak — Noun – English ～ a large cloak worn over evening clothes
• opera house — Noun – English ～ a building where musical dramas are performed
• opera glasses — Noun – English ～ (plural) an optical instrument designed for simultaneous use by both eyes
• opera bouffe — Noun – English ～ opera with a happy ending and in which some of the text is spoken
• Opera — Noun – English ～ a commercial browser
• opera hat — Noun – English ～ a man's hat with a tall crown; usually covered with silk or with beaver fur
• opera hood — Noun – English ～ a large cloak worn over evening clothes
• opera — Noun – English ～ a building where musical dramas are performed
• opera — Noun – English ～ a drama set to music; consists of singing with orchestral accompaniment and an orchestral overture and interludes
• operagoer — Noun – English ～ a patron of the opera
• operand — Noun – English ～ a quantity upon which a mathematical operation is performed
• operant conditioning — Noun – English ～ conditioning in which an operant response is brought under stimulus control by virtue of presenting reinforcement contingent upon the occurrence of the operant response
• operating capital — Noun – English ～ capital available for the operations of a firm (e.g. manufacturing or transportation) as distinct from financial transactions and long-term improvements
• operating instructions — Noun – English ～ a manual usually accompanying a technical device and explaining how to install or operate it
• operating microscope — Noun – English ～ binocular microscope used in surgery to provide a clear view of small and inaccessible parts of the body (as in microsurgery)
• operating expense — Noun – English ～ the expense of maintaining property (e.g., paying property taxes and utilities and insurance); it does not include depreciation or the cost of financing or income taxes
• operating cost — Noun – English ～ the expense of maintaining property (e.g., paying property taxes and utilities and insurance); it does not include depreciation or the cost of financing or income taxes
• operating capability — Noun – English ～ the capability of a technological system to perform as intended
• operating budget — Noun – English ～ a budget for current expenses as distinct from financial transactions or permanent improvements

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