The Oxford 3000 words
The Oxford 3000 is a list of the 3,000 core words that every learner of English needs to know. The words have been chosen based on their frequency in the Oxford English Corpus and relevance to learners of English. Every word is aligned to the CEFR, guiding learners on the words they should know at A1-B2 level.
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o'clock (/əˈklɒk/)
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obey (/əˈbeɪ/)
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object (/əbˈdʒekt/)
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objective (/əbˈdʒektɪv/)
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obligation (/ˌɒblɪˈɡeɪʃn/)
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observation (/ˌɒbzəˈveɪʃn/)
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observe (/əbˈzɜːv/)
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obtain (/əbˈteɪn/)
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obvious (/ˈɒbviəs/)
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obviously (/ˈɒbviəsli/)
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occasion (/əˈkeɪʒn/)
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occasionally (/əˈkeɪʒnəli/)
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occur (/əˈkɜː(r)/)
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ocean (/ˈəʊʃn/)
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october (/ɒkˈtəʊbə(r)/)
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odd (/ɒd/)
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of (/əv/)
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off (/ɒf/)
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offence (/əˈfens/)
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offend (/əˈfend/)
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offensive (/əˈfensɪv/)
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offer (/ˈɒfə(r)/)
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office (/ˈɒfɪs/)
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officer (/ˈɒfɪsə(r)/)
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official (/əˈfɪʃl/)
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often (/ˈɒfn/)
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oh (/əʊ/)
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oil (/ɔɪl/)
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ok (/əʊˈkeɪ/)
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old (/əʊld/)
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old-fashioned (/ˌəʊld ˈfæʃnd/)
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on (/ɒn/)
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once (/wʌns/)
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one (/wʌn/)
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onion (/ˈʌnjən/)
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online (/ˌɒnˈlaɪn/)
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only (/ˈəʊnli/)
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onto (/ˈɒntə/)
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open (/ˈəʊpən/)
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opening (/ˈəʊpənɪŋ/)
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operate (/ˈɒpəreɪt/)
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operation (/ˌɒpəˈreɪʃn/)
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opinion (/əˈpɪnjən/)
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opponent (/əˈpəʊnənt/)
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opportunity (/ˌɒpəˈtjuːnəti/)
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oppose (/əˈpəʊz/)
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opposed (/əˈpəʊzd/)
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opposite (/ˈɒpəzɪt/)
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opposition (/ˌɒpəˈzɪʃn/)
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option (/ˈɒpʃn/)
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or (/ɔː(r)/)
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orange (/ˈɒrɪndʒ/)
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order (/ˈɔːdə(r)/)
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ordinary (/ˈɔːdnri/)
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organ (/ˈɔːɡən/)
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organization (/ˌɔːɡənaɪˈzeɪʃn/)
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organize (/ˈɔːɡənaɪz/)
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organized (/ˈɔːɡənaɪzd/)
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organizer (/ˈɔːɡənaɪzə(r)/)
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origin (/ˈɒrɪdʒɪn/)
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original (/əˈrɪdʒənl/)
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originally (/əˈrɪdʒənəli/)
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other (/ˈʌðə(r)/)
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otherwise (/ˈʌðəwaɪz/)
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ought (/ˈɔːt tə/)
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our (/ɑː(r)/)
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ours (/ɑːz/)
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ourselves (/ɑːˈselvz/)
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out (/aʊt/)
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outcome (/ˈaʊtkʌm/)
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outdoor (/ˈaʊtdɔː(r)/)
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outdoors (/ˌaʊtˈdɔːz/)
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outer (/ˈaʊtə(r)/)
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outline (/ˈaʊtlaɪn/)
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outside (/ˌaʊtˈsaɪd/)
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oven (/ˈʌvn/)
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over (/ˈəʊvə(r)/)
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overall (/ˌəʊvərˈɔːl/)
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owe (/əʊ/)
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own (/əʊn/)
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owner (/ˈəʊnə(r)/)