What does WAVE mean?

noun

1. one of a series of ridges that moves across the surface of a liquid (especially across a large body of water)
2. a movement like that of a sudden occurrence or increase in a specified phenomenon“a wave of settlers”
3. (physics) a movement up and down or back and forth
4. something that rises rapidly“a wave of emotion swept over him”
5. the act of signaling by a movement of the hand
6. a hairdo that creates undulations in the hair
7. an undulating curve
8. a persistent and widespread unusual weather condition (especially of unusual temperatures)“a heat wave”