The continuous line or surface including all the points in space reached by a wave or vibration at the same instant as it travels through a medium. Imaginary surface that represents corresponding points of waves vibrating in unison. As identical waves from the same source travel through a homogeneous medium, corresponding crests and troughs are in phase at any instant; that is, they have completed the same fraction of their periodic motion. Any surface drawn through all points of the same phase constitutes a wave front
(physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium
(physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium all the points just reached by a wave as it propagates