The French Wave is a term used to describe the French New Wave, a movement in French cinema that began in the late 1950s and lasted until the mid-1960s. The two crossword solutions, ADIEU (5 letters) and ONDE (4 letters), are both French words related to the French Wave. ADIEU is a French word meaning goodbye or farewell, while onde is a French word meaning wave. Together, these two words represent the French Wave movement in French cinema.