American English

Definition of beam noun from the Oxford Advanced American Dictionary



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  1. 1a line of light, electric waves, or particles narrow beams of light/sunlight the beam of a flashlight a laser/electron beam a car with its high beams on
  2. 2a long piece of wood, metal, etc. used to support weight, especially as part of the roof in a building The cottage had exposed oak beams.
  3. 3= balance beam
  4. 4a wide and happy smile a beam of satisfaction
See the Oxford Advanced Learner's Dictionary entry: beam