: a line of light coming from a source (such as the sun or a headlight)
: a line of energy, particles, etc., that cannot be seen
: a long and heavy piece of wood or metal that is used as a support in a building or ship
: to smile happily
: to say (something) while smiling happily
: to send out beams of light or energy
What made you want to look up beam? Please tell us where you read or heard it (including the quote, if possible).