Oscillation is the process of moving back and forth regularly, like the oscillation of a fan that cools off the whole room, or the oscillation of a movie plot that makes you laugh and cry.
Oscillation is from the Latin word oscillare for "to swing," so oscillation is when something is swinging back and forth. Rumor has it if you trace the word back far enough, you get to the word for “a little face” of Bacchus, Greek god of wine, people used to hang up in vineyards to swing in the breeze. When there's oscillation, something is going back and forth, like a hanging sculpture going to and fro in the backyard.
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