Define wave?

Question

Define wave?

Answer 1

wave is a mechanism through which energy travels

Answer 2

Well, a wave is a disturbance that carries or transports  energy from one place to another in space.

Answer 3

A wave is a disturbance that propagates through space and time, usually with transference of energy. While a mechanical wave exists in a medium (which on deformation is capable of producing elastic restoring forces), waves of electromagnetic radiation (and probably gravitational radiation) can travel through vacuum, that is, without a medium. Waves travel and transfer energy from one point to another, often with little or no permanent displacement of the particles of the medium (that is, with little or no associated mass transport); instead there are oscillations around almost fixed positions.