What is the meaning of the word "wave"?

Definitions:

a movement like that of a sudden occurrence or increase in a specified phenomenon noun
- a wave of settlers
a persistent and widespread unusual weather condition (especially of unusual temperatures) noun
- a heat wave
move or swing back and forth verb
- They waved their gun.
set waves in verb
- I asked the hairdresser to wave my hair.
signal with the hands or nod verb
- I waved to my friends.
something that rises rapidly noun
- a wave of emotion swept over him