A wave motion is a type of movement that is characterized by the transfer of energy through a medium, such as water or air. The term can refer to both transverse and longitudinal waves. The crossword solutions for the term 'A Wave Motion' are TIDE (4 letters), CREST (5 letters), TSUNAMI (7 letters), Perm (4 letters), and TIDAL (5 letters). TIDE refers to the regular rise and fall of the sea level due to the gravitational pull of the moon and sun. CREST is the highest point of a wave. TSUNAMI is a large ocean wave caused by an underwater earthquake or volcanic eruption. Perm is a type of wave created by wind blowing over a body of water. Lastly, TIDAL is a term used to describe the periodic rise and fall of the sea level due to the gravitational pull of the moon and sun.