English to English Dictionary
English to English vocabulary, definitions, and idioms. Explore comprehensive definitions, pronunciations, grammatical contexts, and cultural origins.
Browse English by Letter(Filtered by Letter “O”)
Clear Letter FilterEnglish Words Starting with “O”
Showing 18 of 33 words/oʊks/ [oaks]
[noun] Plural form of oak; large trees or shrubs of the genus Quercus, noted for their hard wood and lobed leaves.
/əbˈdʒɛk.tər/ [objector]
[noun] A person who raises an objection or expresses formal opposition to something.
/əbˈsiː.kwi.əs.nəs/ [obsequiousness]
[noun] The quality of being excessively obedient, attentive, or servile to an annoying degree.
/ˌɒbzəˈveɪʃənəl ˈɛrər/ [observational error]
[noun] The difference between a measured value of a quantity and its true value, caused by factors related to the observer or the measuring instrument.
/ˌoʊ.ʃiˈæn.ɪk/ [oceanic]
[adjective] Relating to or occurring in the ocean; or, figuratively, vast and immense in scale.
/ˈɒd.ɪ.tiz/ [oddities]
[noun] Strange or peculiar items, features, or behaviors that deviate from what is considered normal or expected.
/ˌɒn ˈkɔːl/ [on call]
[idiom] Available to be summoned for work or duty, especially during hours outside of a regular schedule.
/ɒn rɪˈkwest/ [on request]
[idiom] Available or provided only if specifically asked for by someone.
/wʌn ˈbɪl.jən/ [one billion]
[noun] The cardinal number equal to 1,000,000,000 (one thousand million, or 10^9).
/wʌn ˈaʊər ænd ˈfɔːrti sɪks ˈmɪnɪts/ [one hour and forty six minutes]
[noun] A specific duration of time equivalent to 106 minutes or 6,360 seconds.
/wʌn əv ðə səˈluːʃənz tuː ɛks ˈskwɛər tuː ɛks ˈfɪftɪn ˈzɪroʊ ɪz ɛks ˈθriː wɒt ɪz ðə ˈʌðər səˈluːʃən/ [one of the solutions to x² 2x 15 0 is x 3 what is the other solution]
[noun] An algebraic math problem asking for the remaining root of a quadratic equation given one known solution.
/ˈoʊ.pən/ [open]
[adjective] Not closed, locked, or fastened; allowing access, passage, or view.
/ˈoʊ.pə.nər/ [opener]
[noun] A device or tool used for opening containers, such as cans, bottles, or letters.
/əˈpɪnjən piːs/ [opinion piece]
[noun] An article in a publication such as a newspaper or magazine that expresses the personal views, beliefs, or commentary of the writer rather than purely objective news reporting.
/ˈɒp.ə.zɪt/ [opposite]
[adjective] Situated on the other or further side when compared to something else; facing something, especially talking about positions.
/ˈɒp.tɪ.kəl ɪˈluː.ʒən/ [optical illusion]
[noun] An experience of sight that is deceptive or misleading, causing the viewer to perceive something that differs from objective reality.
/ˈɔːr.ə.kəl/ [oracle]
[noun] A priest or priestess acting as a medium through whom advice or prophecy was sought from the gods in classical antiquity.
/ˈɔːr.əl ˈkæv.ə.ti/ [oral cavity]
[noun] The first part of the alimentary canal that receives food and saliva, bounded by the lips, cheeks, palate, and floor of the mouth; the mouth.