WATER › a line of higher water that moves across the surface of the sea or a lake: I could hear the waves crashing against the rocks.
GROUP › a group of people or things that arrive or happen together or in a short period of time: There has been a wave of kidnappings in the region. Another wave of refugees is arriving at the border.
a wave of hatred/enthusiasm/sadness, etc › when you suddenly feel an emotion: She felt a sudden wave of sadness.
HAND › when you raise your hand and move it from side to side in order to attract someone's attention or say goodbye: She gave a little wave as the train left.
ENERGY › a piece of sound, light, or other energy that travels up and down in a curved pattern: a radio wave → See also new wave → See also tidal wave