Real Dictionary

wave
A wave is a large number of people moving somewhere at the same time.
Waves are the form in which things such as sound, light, and radio signals travel.
countable noun: A wave is a raised mass of water on the surface of water, especially the sea, which is caused by the wind or by tides making the surface of the water rise and fall.
countable noun: A wave is a sudden increase in a particular phenomenon, activity, or type of behaviour, especially an undesirable or unpleasant one.
countable noun: A wave is a sudden increase in heat or energy that spreads out from an earthquake or explosion.
countable noun: If a crowd of people do the wave, each person in the crowd stands up and puts their arms in the air after the person to one side of them, then sits down again, creating a continuous wave-like motion through the crowd.
countable noun: If someone's hair has waves, it curves slightly instead of being straight.
countable noun: If you refer to a wave of a particular feeling, you mean that it increases quickly and becomes very intense, and then often decreases again.
verb: If something waves, it moves gently from side to side or up and down.
verb: If you wave or wave your hand, you move your hand from side to side in the air, usually in order to say hello or goodbye to someone.
verb: If you wave someone away or wave them on, you make a movement with your hand to indicate that they should move in a particular direction.
verb: If you wave something, you hold it up and move it rapidly from side to side.

Wave in American English
to move up and down or back and forth in a curving or undulating motion; swing, sway, or flutter to and fro
noun: a disturbance on the surface of a liquid body, as the sea or a lake, in the form of a moving ridge or swell
noun: a member of the WAVES

wave in British English
noun: one of a sequence of ridges or undulations that moves across the surface of a body of a liquid, esp the sea: created by the wind or a moving object and gravity
verb: to move or cause to move freely to and fro