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Oasis
A pleasant or peaceful area or period in the midst of a difficult or hectic place or situation
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Obdurate
Stubbornly refusing to change one's opinion or course of action
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Obedient
Obeying or willing to obey
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Obeisance
Deferential respect
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Obfuscate
Make obscure, unclear or unintelligible
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Objectify
Degrade to the status of a mere object
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Objectionable
Arousing distaste or opposition, unpleasant or offensive
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Objective
Not influenced by personal feelings or opinions in considering and representing facts
Not dependent on the mind for existence, actual
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Objet d'art
An article of artistic worth
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Objurgate
Rebuke severely, scold
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Obligatory
Required by a legal, moral, or other rule, compulsory
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Oblique
Not expressed or done in a direct way
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Obscurantism
The practice of deliberately preventing the facts or full details of something from becoming known
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Obscure
Not clearly expressed or easily understood
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Obsequious
Obedient or attentive to an excessive or servile degree
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Observant
Quick to notice or perceive things
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Obsession
The state of being obsessed with someone or something
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Obsessive
Of the nature of an obsession
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Obsolete
No longer produced or used, out of date
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Obstinate
Stubbornly refusing to change one's opinion or chosen course of action
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Obstipation
Severe or complete constipation
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Obstreperous
Noisy and difficult to control
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Obstruction
A thing that impedes or prevents passage or progress
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Obtrude
Become noticeable in an unwelcome and intrusive way
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Obtrusive
Noticeable or prominent in an unwelcome or intrusive way
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Obtund
Dull the sensitivity of, blunt, deaden
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Obtuse
Blunt in form, not sharp or acute
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Obverse
The opposite or counterpart of a fact or truth
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Obvert
Alter a proposition so as to infer another proposition with a contradictory predicate
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Obviate
Remove a need or difficulty
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Occasional
Occurring, appearing or done infrequently and irregularly
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Occident
The countries of Europe and America
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Occlude
Stop, close up or obstruct an opening, passage etc
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Ochlocracy
Government by the mob
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Ochlophobia
Fear of crowds
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Octad
A group or series of eight
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Octagon
Polygon having eight angles and eight sides
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Octahedron
A solid figure having eight faces
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Octamerous
Consisting of or divided in eight parts
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Octogenarian
Of the age of 80 years or between 80 and 90 years
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Odious
Extremely unpleasant, repulsive
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Odium
General or widespread hatred or disgust incurred by someone as a result of their actions
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Odyssey
Any long series of wanderings
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Oenophile
A connoisseur of wine
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Officiate
Perform the duties of any office or position
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Officious
Assertive of authority in a domineering way
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Ogle
Stare at in a lecherous manner
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Oleaginous
Rick in, covered with, or producing oil
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Oligarchy
Form of government in which the power is vested in a few, or in a dominant class or clique
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Oligopoly
A state of limited competition, in which a market is shared by a small number of producers or sellers
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Oligopsony
A state of the market in which only a small number of buyers exists for a product
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Omen
An event regarded as a portent of good or evil
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Omerta
The code of silence adhered to by members of the mafia
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Ominous
Giving the worrying impression that something bad is going to happen
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Omission
Someone or something that has been left out or excluded
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Omnifarious
Comprising or relating to all sorts or varieties
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Omnipotent
Having unlimited power
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Omnipresent
Widely or constantly encountered, widespread
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Omniscient
Knowing everything
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Omnium gatherum
A collection of miscellaneous people or things
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Omnivorous
Eating both animal and plant foods
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Onerous
Involving a great deal of effort, trouble or difficulty
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Onset
The beginning of something, especially something unpleasant
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Ontic
Relating to entities and facts about them, relating to real as opposed to phenomenal existence
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Onus
A burden, responsibility
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Onus probandi
Burden of proof
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Opaque
Not able to be seen through; not transparent
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Ophidophobia
The abnormal fear of snakes
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Opine
To hold or express an opinion
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Opportune
Especially convenient or appropriate for a particular action or event
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Oppressive
Inflicting harsh and authoritarian treatment
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Opprobrium
Harsh criticism or censure, public disgrace arising from shameful conduct
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Oppugn
Question the truth or validity of
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Opsimath
A person who begins to learn or study only late in life
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Optimal
Best or most favourable
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Optimise
Make the best or most effective use of a situation or resource
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Optimism
Hopefulness and confidence about the future or success of something
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Opulence
Great wealth of luxuriousness
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Opus
An artistic work, especially one on a large scale
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Oracle
A person or thing regarded as an infallible authority on something
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Oracular
Relating to or resembling an oracle
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Orate
To make a oration, hold forth
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Oration
A formal speech, especially one delivered on a special occasion
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Oratory
The exercise of eloquence in public speaking
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Orbicular
Like an orb, circular etc
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Orchestrate
Plan or coordinate the elements of a situation to produce a desired effect
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Orderly
Neatly and methodically arranged
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Ordinal
Relating to the order of something in a series
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Ordinance
An authoritative order
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Orectic
Of or concerning desire or appetite
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Orifice
Mouth or aperture
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Ornate
Elaborately or highly decorated
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Orotund
Of a person's voice, resonant and imposing
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Orthodox
Following or conforming to the traditional or generally accepted rules or beliefs of a religion, philosophy or practice
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Oscillate
Move or swing back and forth in a regular rhythm
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Oscitant
Yawning from drowsiness
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Osmosis
The process of gradual or unconscious assimilation of ideas, knowledge etc
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Osseous
Consisting of or turned into bone
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Ossify
To convert into, or harden like bone
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Ostensible
Stated or appearing to be true, but not necessarily so
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Ostensive
Directly demonstrative
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Ostentatious
Characterised by pretentious or showy display, designed to impress
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Ostracise
Exclude from a society or group
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Otiose
Serving no practical purpose or result
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Oust
Drive out or expel someone from a position or place
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Outlandish
Looking or sounding bizarre or unfamiliar
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Outlier
A person or thing situated away or detached from the main body or system
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Outrageous
Shockingly bad or excessive
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Outre
Unusual and typically rather shocking
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Outspoken
Frank in stating one's opinions, especially if they are shocking or controversial
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Overabundance
Excessive abundance
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Overt
Done or shown openly, plainly apparent
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Overture
An introduction to something more substantial
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Oxymoron
A figure of speech in which apparently contradictory terms appear in conjunction
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