語彙集

英単語辞書 | 単語の意味、定義、例文

Oar definition card — visual illustration of the meaning
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Oar

noun C1
/ɔːr/

a long pole with a flat blade used to row a boat

"He dipped the oar into the water and pulled the boat forward."

Oasis definition card — visual illustration of the meaning
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Oasis

noun C1
/oʊˈeɪ.sɪs/

a fertile spot in a desert where water is found; a pleasant relief

"After hours in the desert, they finally reached an oasis."

Oath definition card — visual illustration of the meaning
📜

Oath

noun C1
/oʊθ/

a solemn promise, often invoking a divine witness

"She took an oath to tell the truth in court."

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obese

adjective C1
/oʊˈbiːs/

Extremely overweight; having an excessive amount of body fat.

"The doctor advised the obese patient to adopt a healthier lifestyle."

Obituary definition card — visual illustration of the meaning
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Obituary

noun C1
/əˈbɪtʃueri/

A notice of a person's death, often published in a newspaper with a brief biography.

"The newspaper published an obituary for the famous writer."

adjective C1
/əbˈdʒek.ʃən.ə.bəl/

arousing distaste or opposition; unpleasant or offensive

"His objectionable behavior made everyone uncomfortable."

noun C1
/əbˈdʒɛktər/

a person who expresses opposition or disapproval to something

"The objector raised his concerns during the town meeting."

obligatory definition card — visual illustration of the meaning
adjective C1
/əˈblɪɡətɔːri/

Required by law, rule, or custom; mandatory.

"Wearing a helmet is obligatory when riding a motorcycle."

adjective C1
/əˈblaɪdʒɪŋ/

Willing to help or do favors; accommodating.

"The staff at the hotel were very obliging and friendly."

↗️

Oblique

adjective C1
/əˈbliːk/ or /oʊˈbliːk/

Not explicit or direct in addressing a point; slanting or indirect.

"She made an oblique reference to his past mistakes."

obliterate definition card — visual illustration of the meaning
verb C1
/əˈblɪtəreɪt/

To completely destroy, remove, or wipe out.

"The town was obliterated by the powerful earthquake."

oblivion definition card — visual illustration of the meaning
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oblivion

noun C1
/əˈblɪviən/

The state of being completely forgotten or unknown; the state of being unconscious or unaware.

"The ancient city fell into oblivion after the empire collapsed."

oblivious definition card — visual illustration of the meaning
adjective C1
/əˈblɪviəs/

Not aware of or concerned about what is happening around one.

"He was oblivious to the danger approaching him."

adjective C1
/əbˈnɒkʃəs/

Extremely unpleasant, offensive, or annoying.

"The obnoxious behavior of the guest ruined the party."

noun C1
/əbˈzɜːvəns/

The practice of following a custom, rule, or religious law.

"The festival is held in observance of a centuries-old tradition."

adjective C1
/əbˈzɜːvənt/

Quick to notice details or attentive to rules and customs.

"She is very observant and rarely misses any detail."

noun C1
/əbˈzɜːrvətɔːri/

A building equipped for observing astronomical or meteorological events.

"The observatory is open to the public on weekends."

obsess definition card — visual illustration of the meaning
verb C1
/əbˈsɛs/

To preoccupy or fill the mind of someone continually and to an excessive degree.

"She tends to obsess over small details."

adjective C1
/əbˈsɛsɪv/

Relating to or characterized by an obsession; thinking about something too much.

"He has an obsessive interest in cleanliness."

obsolescence definition card — visual illustration of the meaning
noun C1
/ˌɒbsəˈlɛsəns/

The state of being no longer useful or in fashion; becoming outdated.

"The rapid obsolescence of smartphones makes people upgrade frequently."

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obsolete

adjective C1
/ˌɒbsəˈliːt/

No longer in use or out of date.

"Floppy disks are now completely obsolete."

👩‍⚕️

obstetrician

noun C1
/ˌɒbstəˈtrɪʃən/

A doctor specializing in pregnancy, childbirth, and women's reproductive health.

"The obstetrician monitored the mother’s health throughout the pregnancy."

obstinate definition card — visual illustration of the meaning
adjective C1
/ˈɒbstɪnət/

Refusing to change one’s opinion or behavior despite persuasion.

"The child was obstinate about not eating vegetables."

obstruct definition card — visual illustration of the meaning
verb C1
/əbˈstrʌkt/

To block or prevent movement, progress, or action.

"A fallen tree obstructed the road."

noun C1
/əbˈstrʌkʃən/

Something that blocks or gets in the way; the action of obstructing.

"There was an obstruction on the railway track."

adjective C1
/əbˈstrʌk.tɪv/

deliberately creating difficulties or preventing progress; hindering or blocking something

"The obstructive policies hindered economic growth."

adjective C1
/əbˈtjuːs/

slow to understand; annoyingly insensitive; also refers to an angle greater than 90° and less than 180°

"He was too obtuse to realize the insult."

occult definition card — visual illustration of the meaning
adjective C1
/əˈkʌlt/

Relating to mysterious, supernatural, or magical powers and practices.

"She had always been fascinated by the occult and its hidden knowledge."

Occurrence definition card — visual illustration of the meaning
noun C1
/əˈkʌrəns/

An incident, event, or something that happens.

"The occurrence of such storms is rare in this region."

ocean acidification definition card — visual illustration of the meaning
noun C1
ˈoʊʃən əˌsɪdɪfɪˈkeɪʃən

The ongoing decrease in the pH of the Earth's oceans, caused by the absorption of carbon dioxide from the atmosphere.

"Ocean acidification is caused by atmospheric CO2 absorption."

noun C1
/ˈɒktəɡən/

A polygon with eight sides and eight angles.

"The stop sign is shaped like an octagon."

noun C1
/ˈɒktɪv/

A series of eight musical notes, or the interval between one musical pitch and another with double its frequency.

"The singer's voice could easily reach the higher octave."

Oddity definition card — visual illustration of the meaning
noun C1
/ˈɒdəti/

Something strange or unusual.

"The bright pink building was an oddity in the small town."

odyssey definition card — visual illustration of the meaning
noun C1
/ˈɑːdəsi/

a long, adventurous journey; a series of experiences

"Her career has been an odyssey of challenges and achievements."

Offender definition card — visual illustration of the meaning
noun C1
/əˈfɛndər/

a person who commits a crime or does something wrong

"The police caught the offender quickly."

adjective/adverb C1
/ˌɒfˈhænd/

Without previous thought or preparation; casual and sometimes dismissive.

"She gave an offhand reply to his serious question."

verb C1
/əˈfɪʃieɪt/

To perform official duties, especially in a ceremony or as a referee.

"The priest will officiate the wedding ceremony."

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offset

verb C1
/ˈɒfsɛt/

To counterbalance or compensate for something.

"The company's losses were offset by gains in other departments."

noun C1
/ˈɒfʃuːt/

A branch or result that develops from something larger or more important.

"The startup was an offshoot of a major tech company."

offspring definition card — visual illustration of the meaning
noun C1
/ˈɒf.sprɪŋ/

a person's child or children; an animal's young

"The bird carefully fed its offspring."

noun C1
/ˈɔɪntmənt/

A smooth, oily substance applied to the skin for healing or soothing.

"The doctor prescribed an ointment for the burn on his arm."

oligarchy definition card — visual illustration of the meaning
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oligarchy

noun C1
/ˈɑːlɪˌɡɑːrki/

A small group of people having control of a country, organization, or institution.

"The nation was ruled by a wealthy oligarchy that controlled all resources."

Omen definition card — visual illustration of the meaning
🔮

Omen

noun C1
/ˈoʊ.mən/

an event regarded as a sign of future good or bad luck

"Many people consider a black cat crossing your path a bad omen."

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Ominous

adjective C1
/ˈɒmɪnəs/

Giving the impression that something bad or unpleasant is going to happen.

"Dark clouds gave an ominous sign of an approaching storm."

Omission definition card — visual illustration of the meaning
noun C1
/əˈmɪʃən/

The act of leaving out or excluding something; something that has been left out.

"Her omission of important details caused confusion."

omnipresent definition card — visual illustration of the meaning
adjective C1
/ˌɒmnɪˈprɛzənt/

present everywhere at the same time

"In the digital age, social media feels omnipresent in our lives."

🍽️

Omnivorous

adjective C1
/ɒmˈnɪvərəs/

eating both plants and animals

"Humans are generally considered omnivorous creatures."

onerous definition card — visual illustration of the meaning
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onerous

adjective C1
/ˈəʊnərəs/

involving a great deal of effort, difficulty, or burden

"Fulfilling the contract proved to be an onerous task for the company."

Onset definition card — visual illustration of the meaning
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Onset

noun C1
/ˈɒn.sɛt/

The beginning of something, especially something unpleasant.

"The onset of winter brought cold winds and snow."

noun C1
/ˈɒn.slɔːt/

A fierce or destructive attack.

"The village faced an onslaught of enemy forces."