oscillation

Universal Words noun (formal) ~ (between A and B) 1 [U,sing.] a regular movement between one position and another or between one amount and another: the oscillation of the compass needle / of radio waves * the economy's continual oscillation between growth and recession 2 [C] a single movement from one position to another of sth that is oscillating: the oscillations of the pound against foreign currency 3 [U,C] a repeated change between different feelings, types of behaviour or ideas: his oscillation, as a teenager, between science and art * Her oscillations of mood frustrated him.