English Words Starting With O

• on-glide

  nounVery Low
  /ˈɒn ɡlaɪd/A transitional sound, particularly a semi-vowel or fricative, produced as the articulators move from their position for one sound to their position for the following, usually more prominent, vowel or consonant within a single syllable.
• on-ramp

  nounB2
  /ˈɒn.ræmp/A short road leading from an ordinary street to a motorway or freeway, allowing vehicles to accelerate and merge into traffic.
• on-season

  adjectiveadverbnounC1
  /ˌɒn ˈsiːzn̩/The period of the year when a particular activity, sport, product, or travel destination is most popular, available, or officially happening.
• ona

  nounC2 (Essential, Very High Frequency)
  /əʊn/To possess; to have something as property.
• onager

  nounC2 - Extremely Rare
  /ˈɒn.ə.dʒə/A wild ass native to central Asia, specifically the Asiatic wild ass (Equus hemionus).
• onanism

  nounC2+
  /ˈəʊnənɪz(ə)m/Masturbation.
• onanist

  nounVery Low
  /ˈəʊnənɪst/A person who engages in masturbation.
• onassis

  nounC2
  /əʊˈnæsɪs/A proper name, specifically the surname of the prominent 20th-century Greek shipping magnate Aristotle Onassis, which by metonymy has come to represent immense wealth, luxury, and a certain archetype of global business power.
• onate

  nounRare / Obsolete / Technical
  /əʊˈneɪt/(verb) To provide or supply with an essential or desirable item, especially in a generous or lavish manner.
• onbeat

  nounLow
  /ˈɒn.biːt/The accented or metrically strong beat in music; the beat on which the pulse naturally falls.
• onboard

  adjectiveverb-transitiveB2
  /ˌɒnˈbɔːd/to integrate a new person into a system or organisation; to bring something onto a vehicle or vessel.
• onboarding

  nounC1
  /ˈɒn.bɔː.dɪŋ/The process of integrating a new employee into an organisation, familiarising them with its culture, policies, and their role.
• once

  adjectiveadverbconjunctionnounA1
  /wʌns/One single time, at one time in the past.
• once over lightly

  nounC1
  /ˌwʌns ˌəʊvə ˈlaɪtli/A quick, superficial, or cursory examination, review, or treatment of something.
• once-over

  nounC1
  /ˌwʌns ˈəʊvə/A quick, casual, and often superficial look, examination, or inspection of something or someone.
• oncer

  nounRare
  /ˈwʌnsə/A person who does something only once, often used humorously.
• onchocerciasis

  nounVery Low
  /ˌɒŋkəʊsɜːˈkaɪəsɪs/A parasitic disease caused by infection with the filarial worm Onchocerca volvulus, transmitted by blackflies, and characterized by skin lesions and potential blindness.
• oncidium

  nounVery low
  /ɒnˈsɪdɪəm/A tropical American orchid of a large genus (Oncidium) characterized by large sprays of small, often yellow and brown, flowers.
• oncogene

  nounC1
  /ˈɒŋkəʊdʒiːn/A gene that can cause cancer when mutated or overexpressed.
• oncogenesis

  nounLow in general use, High in medical/biological contexts.
  /ˌɒŋkəʊˈdʒɛnɪsɪs/The process of the formation and development of a tumor or cancer.

Showing 1141–1160 of 3187 words.