English Words Starting With E

• equivalence principle

  nounC2/Advanced
  /ɪˌkwɪv.ə.ləns ˈprɪn.sə.pəl/A fundamental concept in physics stating that the effects of gravity are locally indistinguishable from the effects of acceleration.
• equivalence relation

  nounLow
  /ɪˌkwɪv.ə.ləns rɪˈleɪ.ʃən/In mathematics and logic, a relation on a set that is reflexive, symmetric, and transitive, thereby grouping elements into equivalence classes.
• equivalency

  nounC1
  /ɪˈkwɪvələnsi/the condition of being equivalent, equal in value, function, or meaning.
• equivalent

  adjectivenounC1
  /ɪˈkwɪvələnt/Equal in value, amount, function, meaning, or effect.
• equivalent air speed

  nounrare
  /ɪˌkwɪv.əl.ənt ˈeə ˌspiːd/A calibrated airspeed value that represents the airspeed at sea level in the International Standard Atmosphere at which the dynamic pressure is the same as the dynamic pressure at the true airspeed and altitude at which the aircraft is flying.
• equivalent circuit

  nounC2/Technical
  /ɪˈkwɪv.əl.ənt ˈsɜː.kɪt/A simplified theoretical model of an electrical circuit or device that behaves identically (in terms of voltage, current, and power) to a more complex physical system within a defined range of conditions.
• equivalent focal length

  nounC1/C2
  /ɪˈkwɪvələnt ˈfəʊkl leŋθ/A measurement used in photography that expresses the angle of view of a lens when used on a camera with a sensor smaller than a 35mm film frame, allowing comparison between different camera systems.
• equivalent weight

  nounLow
  /ɪˈkwɪvələnt weɪt/The mass of a substance that reacts with or displaces one mole of hydrogen ions (H+) or electrons in a specific chemical reaction; a standard unit for comparing the reacting capacities of elements or compounds.
• equivocate

  verbverb-intransitiveC1/C2
  /ɪˈkwɪvəkeɪt/To use ambiguous or unclear language, especially to avoid commitment or to mislead.
• equivocation

  nounC1
  /ɪˌkwɪvəˈkeɪʃ(ə)n/The use of ambiguous language to conceal the truth or avoid committing to a clear position.
• equivoque

  nounC2
  /ˈɛkwɪvəʊk/A word, phrase, or statement which has more than one meaning and is used ambiguously, often with deliberate intent to mislead or to create humour.
• equuleus

  nounVery Low (extremely rare; technical/astronomical use only)
  /ɪˈkjuːlɪəs/A faint, small constellation in the northern sky, named after a little horse or foal.
• er rif

  nounExtremely Rare to Non-Existent (Not in standard dictionaries)
  /ˈer.ɪf/(Hypothetical construction) A playful, slang adjective describing something or someone that is exceptionally fierce, intense, aggressive, or formidable.
• era

  nounB1
  /ˈɪə.rə/A long and distinct period of history or time, often marked by particular events, characteristics, or a notable person.
• eradiate

  verbverb-ambitransitiveLow (Rare)
  /ɪˈreɪdɪeɪt/To emit rays or waves, such as light or heat; to spread out from a central point.
• eradicate

  verbverb-transitiveC1
  /ɪˈræd.ɪ.keɪt/To destroy completely; to put an end to something, typically something undesirable, by tearing it out by the roots.
• eradication

  nounC1
  /ɪˌræd.ɪˈkeɪ.ʃən/The complete and permanent removal or destruction of something, especially something negative like a disease, problem, or population.
• erase

  verbverb-intransitiveverb-transitiveB1
  /ɪˈreɪz/To remove something completely by rubbing or wiping.
• eraser

  nounA2
  /ɪˈreɪ.zər/A small object, usually made of rubber or a similar material, used to rub out marks made by pencil, chalk, or certain pens.
• erasing head

  nounVery Low (C2)
  /ɪˈreɪzɪŋ hɛd/A component in a magnetic tape recorder or similar device that removes previously recorded signals by applying a magnetic field.

Showing 3081–3100 of 4896 words.