| adoption | (noun) the act of accepting with approval; favorable reception | Synonyms: acceptance, acceptation, espousal |
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| (noun) the appropriation (of ideas or words etc) from another source | Synonyms: borrowing |
| (noun) a legal proceeding that creates a parent-child relation between persons not related by blood; the adopted child is entitled to all privileges belonging to a natural child of the adoptive parents (including the right to inherit) | - |
| fiberoptics | (noun) the transmission of light signals via glass fibers | Synonyms: fiber optics, fibre optics, fibreoptics |
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| fibreoptics | (noun) the transmission of light signals via glass fibers | Synonyms: fiber optics, fiberoptics, fibre optics |
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| nonoptimality | (noun) The state of not being best, most favourable or desirable. | - |
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| optic | (noun) the organ of sight | Synonyms: eye, oculus |
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| optician | (noun) a worker who makes glasses for remedying defects of vision | Synonyms: lens maker |
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| optics | (noun) optical properties | - |
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| (noun) the branch of physics that studies the physical properties of light | - |
| optimisation | (noun) the act of rendering optimal | Synonyms: optimization |
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| optimism | (noun) a general disposition to expect the best in all things | - |
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| (noun) the optimistic feeling that all is going to turn out well | - |
| optimist | (noun) a person disposed to take a favorable view of things | - |
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| optimization | (noun) the act of rendering optimal | Synonyms: optimisation |
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| optimum | (noun) most favorable conditions or greatest degree or amount possible under given circumstances | - |
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| option | (noun) the act of choosing or selecting | Synonyms: choice, pick, selection |
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| (noun) one of a number of things from which only one can be chosen | Synonyms: alternative, choice |
| (noun) the right to buy or sell property at an agreed price; the right is purchased and if it is not exercised by a stated date the money is forfeited | - |
| optionality | (noun) Quality or state in which choice or discretion is allowed. | Synonyms: electiveness |
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| orthoptics | (noun) treatment of defects of binocular vision (such as strabismus and amblyopia) by nonsurgical measures (especially by exercises to strengthen the eye muscles) | - |
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| orthoptist | (noun) a specialist in orthoptics | - |
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| panopticon | (noun) a circular prison with cells distributed around a central surveillance station; proposed by Jeremy Bentham in 1791 | - |
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| (noun) an area where everything is visible | - |
| sarcoptid | (noun) whitish mites that attack the skin of humans and other animals | Synonyms: itch mite |
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