Phase Velocity, Wave Velocity): The speed of propagation of a point of constant phase (or phase angle) of a simple harmonic wave component. Thus, the component sin(2jtA) fr�et) represents a wave of length X traveling in the posidve ^-direction with phase speed c. This concept is to be distinguished from signal velocity, group velocity, and the velocity of fluid parcels. In oceanography, the terms wave velocity or wave celerity are used more commonly than "phase speed