Words To Improve And Enlarge Your English Vocabulary List O


Oaken adv. Made Of Or From Oak.
Oakum n. Hemp-Fiber Obtained By Untwisting And Picking Out Loosely The Yarns Of Old Hemp Rope.
Obdurate adv. Impassive To Feelings Of Humanity Or Pity.
Obelisk n. A Square Shaft With Pyramidal Top, Usually Monumental Or Commemorative.
Obese adv. Exceedingly Fat.
Obesity n. Excessive Fatness.
Obituary adv. A Published Notice Of A Death.
Objective adv. Grasping And Representing Facts As They Are.
Objector n. One Who Objects, As To A Proposition, Measure, Or Ruling.
Obligate v. To Hold To The Fulfillment Of Duty.
Obligatory adv. Binding In Law Or Conscience.
Oblique adv. Slanting; Said Of Lines.
Obliterate v. To Cause To Disappear.
Oblivion n. The State Of Having Passed Out Of The Memory Or Of Being Utterly Forgotte
Obsequies n. Funeral Rites.
Obsequious adv. Showing A Servile Readiness To Fall In With The Wishes Or Will Of Another.
Observance n. A Traditional Form Or Customary Act.
Observant adv. Quick To Notice.
Observatory n. A Building Designed For Systematic Astronomical Observations.
Obsolescence n. The Condition Or Process Of Gradually Falling Into Disuse.
Obsolescent adv. Passing Out Of Use, As A Word.
Obsolete adv. No Longer Practiced Or Accepted.
Obstetrician n. A Practitioner Of Midwifery.
Obstetrics n. The Branch Of Medical Science Concerned With The Treatment And Care Of Women During Pregnancy.
Obstinacy n. Stubborn Adherence To Opinion, Arising From Conceit Or The Desire To Have One’S Own Way.
Obstreperous adv. Boisterous.
Obstruct v. To Fill With Impediments So As To Prevent Passage, Either Wholly Or In Part.
Obstruction n. Hindrance.
Obtrude v. To Be Pushed Or To Push Oneself Into Undue Prominence.
Obtrusive adv. Tending To Be Pushed Or To Push Oneself Into Undue Prominence.
Obvert v. To Turn The Front Or Principal Side Of (A Thing) Toward Any Person Or Object.
Obviate v. To Clear Away Or Provide For, As An Objection Or Difficulty.
Occasion n. An Important Event Or Celebratio
Occident n. The Countries Lying West Of Asia And The Turkish Dominions.
Occlude v. To Absorb, As A Gas By A Metal.
Occult adv. Existing But Not Immediately Perceptible.
Occupant n. A Tenant In Possession Of Property, As Distinguished From The Actual Owner.
Occurrence n. A Happening.
Octagon n. A Figure With Eight Sides And Eight Angles.
Octave n. A Note At This Interval Above Or Below Any Other, Considered In Relation To That Other.
Octavo n. A Book, Or Collection Of Paper In Which The Sheets Are So Folded As To Make Eight Leaves.
Octogenarian adv. A Person Of Between Eighty And Ninety Years.
Ocular adv. Of Or Pertaining To The Eye.
Oculist n. One Versed Or Skilled In Treating Diseases Of The Eye.
Oddity n. An Eccentricity.
Ode n. The Form Of Lyric Poetry Anciently Intended To Be Sung.
Odious adv. Hateful.
Odium n. A Feeling Of Extreme Repugnance, Or Of Dislike And Disgust.
Odoriferous adv. Having Or Diffusing An Odor Or Scent, Especially An Agreeable One.
Odorous adv. Having An Odor, Especially A Fragrant One.
Off adv. Farther Or More Distant.
Offhand Ad v. Without Preparation.
Officiate v. To Act As An Officer Or Leader.
Officious adv. Intermeddling With What Is Not One’S Concer
Offshoot n. Something That Branches Off From The Parent Stock.
Ogre n. A Demon Or Monster That Was Supposed To Devour Human Beings.
Ointment n. A Fatty Preparation With A Butter-Like Consistency In Which A Medicinal Substance Exists.
Olfactory adv. Of Or Pertaining To The Sense Of Smell.
Olive-Branch n. A Branch Of The Olive-Tree, As An Emblem Of Peace.
Ominous adv. Portentous.
Omission n. Exclusio
Omnipotence n. Unlimited And Universal Power.
Omnipotent adv. Possessed Of Unlimited And Universal Power.
Omniscience n. Unlimited Or Infinite Knowledge.
Omniscient adv. Characterized By Unlimited Or Infinite Knowledge.
Omnivorous adv. Eating Or Living Upon Food Of All Kinds Indiscriminately.
Onerous adv. Burdensome Or Oppressive.
Onrush n. Onset.
Onset n. An Assault, Especially Of Troops, Upon An Enemy Or Fortificatio
Onslaught n. A Violent Onset.
Onus n. A Burden Or Responsibility.
Opalescence n. The Property Of Combined Refraction And Reflection Of Light, Resulting In Smoky Tints.
Opaque adv. Impervious To Light.
Operate v. To Put In Action And Supervise The Working Of.
Operative adv. Active.
Operator n. One Who Works With Or Controls Some Machine Or Scientific Apparatus.
Operetta n. A Humorous Play In Dialogue And Music, Of More Than One Act.
Opinion n. A Conclusion Or Judgment Held With Confidence, But Falling Short Of Positive Knowledge.
Opponent n. One Who Supports The Opposite Side In A Debate, Discussion, Struggle, Or Sport.
Opportune adv. Especially Fit As Occurring, Said, Or Done At The Right Moment.
Opportunist n. One Who Takes Advantage Of Circumstances To Gain His Ends.
Opportunity n. Favorable Or Advantageous Chance Or Opening.
Opposite adv. Radically Different Or Contrary In Action Or Movement.
Opprobrium n. The State Of Being Scornfully Reproached Or Accused Of Evil.
Optic n. Pertaining To The Eye Or Visio
Optician n. One Who Makes Or Deals In Optical Instruments Or Eye-Glasses.
Optics n. The Science That Treats Of Light And Vision, And All That Is Connected With Sight.
Optimism n. The View That Everything In Nature And The History Of Mankind Is Ordered For The Best.
Option n. The Right, Power, Or Liberty Of Choosing.
Optometry n. Measurement Of The Powers Of Visio
Opulence n. Affluence.
Opulent adv. Wealthy.
Oral adv. Uttered Through The Mouth.
Orate v. To Deliver An Elaborate Or Formal Public Speech.
Oration n. An Elaborate Or Formal Public Speech.
Orator n. One Who Delivers An Elaborate Or Formal Speech.
Oratorio n. A Composition For Solo Voices, Chorus, And Orchestra, Generally Taken From The Scriptures.
Oratory n. The Art Of Public Speaking.
Ordeal n. Anything That Severely Tests Courage, Strength, Patience, Conscience, Etc.
Ordinal n. That Form Of The Numeral That Shows The Order Of Anything In A Series, As First, Second, Third.
Ordination n. A Consecration To The Ministry.
Ordnance n. A General Name For All Kinds Of Weapons And Their Appliances Used In War.
Orgies n. Wild Or Wanton Revelry.
Origin n. The Beginning Of That Which Becomes Or Is Made To Be.
Original adv. Not Copied Nor Produced By Imitatio
Originate v. To Cause Or Constitute The Beginning Or First Stage Of The Existence Of.
Ornate adv. Ornamented To A Marked Degree.
Orthodox adv. Holding The Commonly Accepted Faith.
Orthodoxy n. Acceptance Of The Common Faith.
Orthogonal adv. Having Or Determined By Right Angles.
Orthopedic adv. Relating To The Correcting Or Preventing Of Deformity
Orthopedist n. One Who Practices The Correcting Or Preventing Of Deformity
Oscillate v. To Swing Back And Forth.
Osculate v. To Kiss.
Ossify v. To Convert Into Bone.
Ostentation n. A Display Dictated By Vanity And Intended To Invite Applause Or Flattery.
Ostracism n. Exclusion From Intercourse Or Favor, As In Society Or Politics.
Ostracize v. To Exclude From Public Or Private Favor. Ought
Out-And-Out Ad v. Genuinely.
Outbreak n. A Sudden And Violent Breaking Forth, As Of Something That Has Been Pent Up Or Restrained.
Outburst n. A Violent Issue, Especially Of Passion In An Individual.
Outcast n. One Rejected And Despised, Especially Socially.
Outcry n. A Vehement Or Loud Cry Or Clamor.
Outdo v. To Surpass.
Outlandish adv. Of Barbarous, Uncouth, And Unfamiliar Aspect Or Actio
Outlast v. To Last Longer Than.
Outlaw n. A Habitual Lawbreaker.
Outlive v. To Continue To Exist After.
Out-Of-The-Way adv. Remotely Situated.
Outpost n. A Detachment Of Troops Stationed At A Distance From The Main Body To Guard Against Surprise.
Outrage n. A Gross Infringement Of Morality Or Decency.
Outrageous adv. Shocking In Conduct.
Outreach v. To Reach Or Go Beyond.
Outride v. To Ride Faster Than.
Outrigger n. A Part Built Or Arranged To Project Beyond A Natural Outline For Support.
Outright Ad v. Entirely.
Outskirt n. A Border Regio
Outstretch v. To Extend.
Outstrip v. To Go Beyond.
Outweigh v. To Surpass In Importance Or Excellence.
Overdo v. To Overtax The Strength Of.
Overdose n. An Excessive Dose, Usually So Large A Dose Of A Medicine That Its Effect Is Toxic.
Overeat v. To Eat To Excess.
Overhang n. A Portion Of A Structure Which Projects Or Hangs Over.
Overleap v. To Leap Beyond.
Overlord n. One Who Holds Supremacy Over Another.
Overpass v. To Pass Across Or Over, As A River.
Overpay v. To Pay Or Reward In Excess.
Overpower v. To Gain Supremacy Or Victory Over By Superior Power.
Overproduction n. Excessive Productio
Overreach v. To Stretch Out Too Far.
Overrun v. To Infest Or Ravage.
Oversee v. To Superintend.
Overseer n. A Supervisor.
Overshadow v. To Cast Into The Shade Or Render Insignificant By Comparison.
Overstride v. To Step Beyond.
Overthrow v. To Vanquish An Established Ruler Or Government.
Overtone n. A Harmonic.
Overture n. An Instrumental Prelude To An Opera, Oratorio, Or Ballet.
Overweight n. Preponderance.

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