oscillation

US /ˌɑː.səlˈeɪ.ʃən/
UK /ˌɑː.səlˈeɪ.ʃən/
"oscillation" picture
1.

the action of swinging or moving to and fro.

:
The oscillation of the pendulum was mesmerizing.
We observed the rapid oscillation of the spring.
2.

variation in magnitude or position around a central point.

:
The stock market experienced significant oscillation throughout the day.
The temperature showed a clear oscillation between day and night.