- 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
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- 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= balance beam
- 4a wide and happy smile a beam of satisfaction
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