English Words Starting With O

• omission

  nounC1
  /əˈmɪʃ(ə)n/The act of leaving something out or the thing that has been left out.
• omit

  verbverb-transitiveB2
  /ə(ʊ)ˈmɪt/to leave something out; to not include something or someone intentionally or by accident
• omitted

  adjectiveverbB2
  /ə(ʊ)ˈmɪtɪd/left out or excluded, either intentionally or accidentally
• omiya

  nounNot applicable (proper noun/foreign term) / Extremely Rare (if treated as a lexical entry)
  /ɒˈmiːjə/ or /əʊˈmiːjə/The term is not a standard word in the English lexicon. It may be a proper noun (e.g., a place name in Japan, a surname), a transliteration from another language, or a potential typographical error.
• ommateum

  nounRare / Technical
  /ˌɒməˈtiːəm/The compound eye of an insect or other arthropod.
• ommatidium

  nounVery Low
  /ˌɒməˈtɪdɪəm/One of the individual visual units that make up the compound eye of arthropods and some other animals.
• ommatophore

  nounVery Low
  /ˈɒm.ə.tə(ʊ)ˌfɔː/A movable stalk or peduncle bearing an eye, found in certain invertebrates.
• ommiad

  nounVery Low
  /əˈmaɪæd/A member of or relating to the Umayyad dynasty, which ruled the Islamic caliphate from 661 to 750 CE.
• omnibearing

  nounVery Low
  /ˌɒmnɪˈbeərɪŋ/Relating to or capable of receiving signals from, or transmitting in, all directions simultaneously.
• omnibus

  adjectivenounC1/C2
  /ˈɒmnɪbəs/A single volume or programme containing several items, especially novels, episodes, or musical pieces, that were previously published or broadcast separately.
• omnibus clause

  nounC2
  /ˈɒmnɪbəs ˌklɔːz/A provision in a legal document or insurance policy that extends coverage to items or persons not specifically named.
• omnicide

  nounVery Low / Specialist
  /ˈɒm.nɪ.saɪd/The total annihilation of all life, typically human, potentially on a global or cosmic scale.
• omnidistance

  nounExtremely Rare (Specialized)
  /ˌɒmnɪˈdɪst(ə)ns/A state or condition of being equally distant from or to all points, or a hypothetical universal distance measure.
• omnigraph

  nounVery low / Obsolete technical
  /ˈɒmnɪɡrɑːf/An instrument for converting coded telegraphic signals into written characters.
• omnipotence

  nounC2
  /ɒmˈnɪpətəns/the quality or state of having unlimited or very great power.
• omnipotent

  adjectivenounC2
  /ɒmˈnɪpətənt/Having unlimited or very great power; all-powerful.
• omnirange

  nounVery Low
  /ˈɒmnɪˌreɪndʒ/A type of long-range navigational system using radio beacons.
• omniscience

  nounC1
  /ɒmˈnɪs.i.əns/The state of knowing everything.
• omniscient

  adjectivenounC1/C2
  /ɒmˈnɪs.i.ənt/Knowing everything; having complete or unlimited knowledge.
• omnisexual

  adjectivenounlow
  /ˌɒmnɪˈsɛkʃʊəl/characterised by or involving a sexual attraction to people of all sexes and genders

Showing 1101–1120 of 3187 words.