What is the meaning of the word "beam"?

Definitions:

the broad side of a ship noun
- they sighted land on the port beam
to broadcast over the airwaves, as in radio or television verb
- We beamed the program all over the world.
to emit light verb
- The flashlight beamed with great intensity.
to experience a feeling of well-being or happiness, as from good health or an intense emotion verb
- I was beaming with joy.
to express with a cheerful face or smile verb
- I beamed with approval.
to have a complexion with a strong bright color, such as red or pink verb
- You're really beaming.
to smile radiantly verb
- I beamed after winning the lottery.