oscillation
🇺🇸
/ˌɑːsɪˈleɪʃn/
🇬🇧
/ˌɒsɪˈleɪʃn/
A back-and-forth movement, like a swing going from one side to the other.
The swing's oscillation made a soothing rhythm.
A single movement from one point to another in a back-and-forth motion.
The pendulum made a smooth oscillation.
Going back and forth between different feelings, behaviors, or ideas.
His oscillation between optimism and despair was confusing.