wavewavewaves1noun1one of the lines of water that moves across the top of the sea: Waves crashed against the cliffs.2a movement of your hand from side to side in the air, to say hello or goodbye, or to make a sign to somebody: As she turned the corner, she gave me a wave.3a gentle curve in hair4the form that some types of energy such as heat, light and sound take: radio waveswavewavewaveswavedwaving2verb (waves, waving, waved)1to move your hand from side to side in the air to say hello or goodbye, or to make a sign to somebody: She waved to me as the train left the station. Who are you waving at?2to move something quickly from side to side in the air: The children waved flags as the President's car drove past.3to move up and down or from side to side: The flags were waving in the wind. see Picture Dictionary for video