English Words Starting With O

• obligor

  nounC2
  /ˈɒblɪɡɔː/A person or entity (such as a company, government, or individual) who is legally bound to perform an obligation or duty, especially to pay a debt or fulfill the terms of a contract.
• oblique

  adjectiveadverbnounverbverb-intransitiveC1
  /əˈbliːk/Neither parallel nor at a right angle; slanting.
• oblique angle

  nounLow
  /əˈbliːk ˈæŋɡl̩/An angle that is not a right angle (90°) nor a multiple of a right angle; specifically, any angle other than 0°, 90°, 180°, 270°, or 360°.
• oblique circular cone

  nounC2
  /əˌbliːk ˈsɜːkjələ kəʊn/A cone whose axis is not perpendicular to its circular base plane.
• oblique circular cylinder

  nounC2
  /əˌbliːk ˈsɜːkjʊlə ˈsɪlɪndə/A three-dimensional geometric shape in which the bases are parallel circles of equal size, and the axis joining the centers of these circles is not perpendicular to the planes containing the circles.
• oblique coordinates

  plural-nounVery Low
  /əˈbliːk kəʊˈɔːdɪnəts/A coordinate system in which the axes are not perpendicular to each other.
• oblique fault

  nounVery Low
  /əˈbliːk fɔːlt/A type of geological fault where rock masses move both horizontally and vertically along a diagonal fracture plane.
• oblique motion

  nounC2
  /əˌbliːk ˈməʊʃ(ə)n/In music theory, the movement of one voice (or part) while another remains on the same pitch.
• oblique projection

  nounLow
  /əˈbliːk prəˈdʒɛkʃən/A type of technical drawing or map projection where parallel lines of the object are drawn at an angle (typically 45°) to the projection plane, preserving scale along those axes but creating a three-dimensional illusion.
• oblique sailing

  nounVery Low
  /əˈbliːk ˈseɪlɪŋ/A method of navigation in which a ship sails on a course that is not directly toward the destination, often to account for wind or currents.
• oblique section

  nounC2
  /əˈbliːk ˈsɛkʃən/A cut or slice through an object at an angle that is not perpendicular to its main axis.
• oblique triangle

  nounC1
  /əˈbliːk ˈtraɪæŋɡl̩/A triangle that does not contain a right angle (90-degree angle).
• oblique-slip fault

  nounVery low frequency
  /əˌbliːk ˈslɪp fɔːlt/A type of geological fault where the movement is primarily horizontal (strike-slip) but has a significant vertical component (dip-slip) as well.
• obliquity

  nounC2
  /əˈblɪk.wə.ti/The state of being at an angle, especially one that is not a right angle; deviation from a straight line or correct course.
• obliterate

  verbverb-transitiveC1/C2
  /əˈblɪtəreɪt/To destroy something completely, leaving no trace; to wipe out.
• obliterated

  adjectiveverbB2
  /əˈblɪtəreɪtɪd/To destroy completely, leaving no trace; to wipe out.
• obliteration

  nounC1
  /əˌblɪt.ərˈeɪ.ʃən/The action or fact of destroying something completely, erasing all traces of it.
• oblivescence

  nounExtremely Rare / Archaic / Obsolete
  /ˌɒblɪˈvɛs(ə)ns/The act or process of forgetting.
• oblivion

  nounC1
  /əˈblɪv.i.ən/The state of being completely forgotten or unknown; the state of being unaware or unconscious of what is happening.
• obliviousness

  nounC1
  /əˈblɪv.i.əs.nəs/The state or condition of being unaware, unconscious, or forgetful of something.

Showing 161–180 of 3187 words.