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oxymoron-noun;-plural-oxymora or oxymorons
a rhetorical figure in which incongruous or contradictory terms are combined, as in 'a deafening silence' and 'a mournful optimist'; humourous oxymorons
oxymoronic-adjective
oxymoronically-adverb

obligate, obligated, obligating, obligates-transitive verbs
to bind, compel, or constrain by a social, legal, or moral tie; to cause to be grateful or indebted; oblige; to commit (money, for example) in order to fulfill an obligation
obligable-adjective
obligately-adverb
obligator-noun
synonym-force
obligation-noun
the constraining power of a promise, contract, law, or sense of duty; the act of binding oneself by a social, legal, or moral tie; a social, legal, or moral requirement, such as a duty, contract, or promise that compels one to follow or avoid a particular course of action; a course of action imposed by society, law, or conscience by which one is bound or restricted; something owed as payment or in return for a special service or favor; the service or favor for which one is indebted to another; the state, fact, or feeling of being indebted to another for a special service or favor received
obligational-adjective
synonyms-responsibility, duty
obligatory-adjective
morally or legally constraining; binding; imposing or recording an obligation; of the nature of an obligation; compulsory (attendance is obligatory) 
obligatorily-adverb

Orion
a constellation in the celestial equator near Gemini and Taurus, containing the stars Betelgeuse and Rigel

Ockham
"The English Scholastic William of Ockham formulated the most radically nominalistic criticism of the Scholastic belief in intangible, invisible things such as forms, essences, and universals. He maintained that such abstract entities are merely references of words to other words rather than to actual things. His famous rule, known as Ockham's razor, which said that one should not assume the existence of more things than are logically necessary, became a fundamental principle of modern science and philosophy." ... Microsoft® Encarta® Encyclopedia 99.

ovary
botany – the ovule bearing lower part of a pistil that ripens into a fruit

ovule-noun
a minute structure in seed plants, containing the embryo sac and surrounded by the nucellus, that develops into a seed after fertilization
ovular or ovulary-adjective

octahedral-adjective
having eight plane surfaces
octahedrally-adverb

oath-noun;-plural-oaths
a solemn, formal declaration or promise to fulfill a pledge, often calling on God or a sacred object as witness; something declared or promised

ordinance-noun
a command or order coming from an authorized body; a custom or practice established by long usage; a statute or regulation, especially one enacted by a city government

omission-noun
the act or an instance of omitting; the state of having been omitted; something omitted or neglected
omit, omitted, omitting, omits-transitive verbs
to fail to include or mention; leave out (omit a word)

obtrude, obtruded, obtruding, obtrudes-verbs
transitive senses-to impose-(oneself or one's ideas) on others with undue insistence or without invitation; intrude; to thrust out; push forward
intransitive senses-to impose oneself on others
obtruder, obtrusion-nouns

oft-adverb
often

oftentimes-noun,  also ofttimes-adverb
frequently; repeatedly

oodles-plural, noun
a great amount or number (oodles of fun)

obsessive-adjective
of, relating to, characteristic of, or causing an obsession-(obsessive gambling); excessive in degree or nature (an obsessive need to win)
obsessive, obsessiveness-nouns
obsessively-adverb

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